Yeah, there's definitely room for improvement there. Maybe award points for killing an enemy in the neighbourhood of the treasure similar to Killzone 2 would also help. My team just now definitely won because I had 9 kills (vs 2 deaths) some from keeping an area covered to keep the enemy away, and some from killing enemy coming in to get the treasure from behind (got two medals, one for fistycufs and one for brawler, very cool). Also in another match we had a guy standing near the treasure chest, and we'd throw up the treasure towards him and he'd put in there. Of course he got the points, but we should get some too.
Other than that though, I'm liking Uncharted for the multiplayer gameplay a lot more than I expected! The freedom of movement, the hand-to-hand, it all works very well! I think it definitely has a future - all it needs is some additional modes that play even more to the strengths of the game (plunder is a nice start, being able to throw the treasure around is a lot of fun).