I have SEVERAL suggestions for your map, most of which, I don't know if you can, or wish to fix or add in, but nonetheless, in my humble opinion I will believe they would enhance your map drastically to fit the Battle of Geonosis.
I will list them in this order.
Gameplay, Visual, and sound.
First the gameplay.
-Reorient the AT-TEs in a succesive pattern from left to right, and facing the battlefield, perhaps put one to the left of the command centre near the ARC-170s and create a pathway for the AI to follow, to engage the Spider Walkers that take the route around the destroyed CIS Ship. As it currently stands you have them in such a way they get stuck on each other constantly, and a simple movement of these walker may fix that problem.
-Remove the CIS Strike Bombers and ARC-170s from the ground. I do not know the intention of your map, multiplayer, LAN, or singleplayer, but as it stands both the ARC-170s, and CIS Bombers both are very much over powered for this map. The CIS Strike Bomber can literally kill DOZENS of troops in a single bombing run, while the ARC-170s either get in the way of the troops, crash immediately after take off, or do take off but then cease to do anything to actually help. The LAAT Gunship is fine as it is due to the accuracy of its laser guns, and its torpedos. And no, I am not saying remove all the ARC-170s and CIS Strike Bombers from the map, just to remove the ones on the ground.
-The crashed and destroyed AT-TEs, and LAAT Gunships are a either scattered to much to not be worth any significant value in the map, or put into such a small area with so many, that the they just clog the entire flow of the battle up, and block the very large Spider Walkers and AT-TEs from actually being able to push through. I suggest removing or moving the ones directly around the CIS bases (they're directly in the pathway of the Spider walkers and they constantly get caught on them as do the troops).
-The Droid CIS Flagship should be removed entirely, and the Droid Control Ship should be put in its place as the main starship for the CIS. This isn't that much of a detriment to gameplay, but it is VERY WEIRD to be seeing that long cynlidrical object of a CIS Capital Ship sitting above the Republic's base, especially it being the Clone Wars, and not ROTS. O_o
-The list of selectable classes is slightly screwed. As it is, there is a small "List of Profiles" bar at the bottom of the screen. Which is neither selectable, and cannot be seen in its entirety, in any resoution. I don't know if you can remedy that though. :/
-The Republic seems to be full of idiots. I have noticed that if I do not play as the Republic, they seem to lose VERY QUICKLY, and after a while will not even take bases, and their only counter for this loss is the large numbers they have at each base, who are, sitting on their asses.
UPDATE: After playing it a bit more, the Republic being full of idiots is not the case, apparently, somehow this was rectified with 1.5
But once again this is probably more a problem with BFII and its ridiculous AI coding then your map.
-Reorganization of nearly all land vehicles. Now this is the most glaring problem of the map that I at first noticed. The organization of the ground based vehicles and air vehicles is either far to sporadic, or disorganized, or completely half-assed in general. The AT-TEs do not need mention, the LAAT Gunships, could or be moved behind the AT-TEs, and the air vheicles (excluding the LAAT) could be removed, or moved entirely from their current positions, and especially the CIS bombers, because the troops and Spider Walkers are once again constantly getting hitched on them.
-No death zone for flying outside of the map edge. I realize you removed this from the map because of the addition of air vehicles require dogfighting space, but I could literally drive a AT-TE right out side of the map if I wanted.
-Now this is another little problem I have with the map, the battle of Geonosis, just had Droid Starfighters, Jedi Starfighters, the LAAT Gunships and the Geonosian Starfighter.
-Far to many capital ships. Maybe 2-3, but there's five, that's quite a few polygons that could be used elsewhere and performence could be increaseed (like mine

) on slower machines. Three of the ships are completely unusable, the two CIS droid Control ships do not have ANY hangers or CPs, and the the Republic's Cruiser is beyond the range of the flight ceiling for all of the starships.
-Another thing that irks me about the battle is the walkers you just recently put in. I think the Republic's hovertanks, or even the SPHA-T (don't think there's a model of it though, let alone being it animated, textured, and working

) would've been a better choice in my opinion.
-Mini-map in the spawn menu/mini-map is offset, the CP, soldiers, and practically everything else appear completely off from their actual positions on the visual map.
Other then that, gameplay is great, and really makes it seem like a gigantic battle whether then a small skirmish ESPECIALLY with the latest 1.5 version. My god, XL mode is nothing compared to what you made!
Now visuals.
-Lighting, I don't know what exactly is wrong with the lighting, but there is definitely a problem with it. The shadows, background quality, and lighting all seem different to one another, and it just does not feel like a arid, hot, and hostile environment. The lighting from the unmodified version of Geonosis in BFII feels much better. I don't know if you can fix this one, although I am sure you can, and in my opinion I believe it would add to your map's atmosphere greatly.
-Dust. Where is it?

But seriously, where is it? Geonosis is dusty, possiblely so dusty that not even billions of cans of Pledge could wipe it clean. Oh, and windy!
-The 2D Dogfighting LAATS and Droid Fighters field needs to be moved a bit, they kind of 'collide' (disappear) with the capital ships, and it throws the whole maps feel for a loop, but please don't take it out, it's an awesome visual especially when you start getting the actually LAAT and fighters battling.
-In some instances, and this is of course to be expected due to the size of the map, and battle, the sprite limit is reached. This is most likely unfixable, unless you removed some things. And we wouldn't want that now.
-The map is title 'Diet Dr. Pepper' in the list of maps in Instant Action. Along with a description that says 'Diet Dr. Pepper!'. Might want to fix that.
Other then that, everything is fantastic.
Now on to sound.
-There is no music while battling, UNLESS I play as a hero, such as Dooku, and General Grieveous.
-Sounds for all air vehicles do not work, or are not present.
And these are pretty much the only problems I see with your map, other then some tweaking for gameplay balances, and some more polish, I think you could have one of the best maps, Battlefront has ever known.
Oh, and sorry if this all has been stated before, I jsut didn't feel like reading through 19 pages of replies.