Playability: It's good fun and pretty accurate as it goes.
Longevity: Little short to be honest, though there are a good few hours of game play in there in the single player. If you've got mates that come over or want to play it online I'm sure that's a whole other world.
Markers: It's a 2005 game and so the markers are reflective of this, and personally I found them a little limited. The more money you make the better the guns you can buy are, though you need to save up quite a bit to get the top end markers (DM5, Karnivor). There are no shockers, angels or egos to buy, though some of the other players you get on your team have these, annoyingly. When your character is shot out you switch to another player and so you will get to shoot them.
Few too many woodsball tournaments for me, and a lack of story with the tournaments is a shame. It doesn't follow a series or anything like that which would have made it much more interesting, going for promotion and that through a series rather than amateur, rookie and pro in single tournaments around the world.
For £15 (new) you can't really go wrong, and I'm sure you could get a cheap xbox about nowadays.