Other people can cover the insta/effic perspective of both maps, so I'll cover the aspect which no one cares about.
I agree with Savvy that the GA and YA should be swapped. Pistol pickups are absolutely useless, so remove those. A lot of the ammo pickups are too close together, and there are too many. It is a small ffa map, but it's not like it plays the way turbine does. It's more like douze, in that there are actually some tactics despite the style of the map (pit).
I counted four rocket pickups. I think you should remove this one, and put that rifle pickup where the rocket is.
http://i.imgur.com/MN9Siys.jpgThere are what, four grenade pickups? Remove these two, probably:
http://i.imgur.com/u5CpkP3.jpg http://i.imgur.com/ZeKfvWQ.jpg (one left of crosshair) You might notice I took out the pistol pickups in the screens ^^
The map may need some more pickup cleaning up, or repositioning, but this would be a solid start.
Cartel,
It is a little bit difficult to get up on the shown platform of boxes (
http://imgur.com/w72fDi9) when coming from left if facing this way (
http://imgur.com/uwvVzOw). This passage can be useful, but can also be really dangerous if your enemy has adequate position onto there (
http://imgur.com/GFhZmq4). Therefore, might be better to make the risk worth the reward, and put in a rocket pickup there. This would put the map at four rocket pickups, might prove to be an issue.
I want a beam of light here (
http://imgur.com/2AmjILb) if at all possible. While giving no gameplay value, that'd be cool.
I am seeing the blue tint Potato was talking about cause of the fog, but I actually like that. Depending on how much you expand it, might have to decrease it a wee bit.
The great thing about expanding it a little and making it good for 2v2 is that it'll still probably be good for duels, like hades or corruption are, but still good for 2v2. If you do that. It's still probably playable for 2v2, but it'd be very intense. Adding another GA for a map with the intention being 2v2 could be good too, I always like that.