Saw this on the Xbox Live Arcade and gave it a try. I loved it, but I'm a former lacrosse player, so I'm a little biased. Played like an old school SEGA hockey game. Oddly enough they did a pretty good job with the AI. Lacrosse is actually a lot like b-ball with the pick-n-rolls. One part they can't do well is feeding from behind the net. That's a pretty critical part of a lacrosse offense. Overall, a fun play.

http://www.youtube.com/watch?v=jrl4zwdJtNI

If I were to make a really good lacrosse game I would have:
1) spin moves and dodges like Madden does with running backs
2) graphics where they change hands depending on the position of the defender
3) make the field longer
4) feeding from behind the net (and perhaps the ability to call plays like picks and sweeps)
5) better checking and graphics (want to see sticks fly or crack when you lay a good hit)
6) ground ball struggles
7) ability to move the goalie out of the net when he has the ball
8.) power up shot from in front of the key (kinda like a hard slap shot in NHL)
9) better face offs
10) fans with T-shirts that say "Long Sticks Get Chicks"