Well, if you're a fan of Halo Reach's Invasion or Battlefield Bad Company 2's Rush, you'll probably find something in Brink to like. If you want, say, a campaign then you're sorely out of luck because Invasion/Rush is all there is to this game. The art direction is superb and Smart is a nice movement mechanic but the overall structure of Attack and Defend on single objectives (by those which determine winning and loosing) in what are essentially linear environments leaves much to be desired for anyone who isn't a dedicated fan of that particular style of play.
Hopefully DLC will expand on Brinks deficient core with Team Death match, at the very least, to take advantage of the possiblities that fluid and fast movement present (which are lost on any objective this game has to offer for the simple fact that any strategy considering
must involve stationary defense and over targets which might take
minutes to hack/repair/otherwise interact with) but for now you'd be at no great loss without this game, it's pitiful grenades (which would probably fall under the catagory of "completely trivial" under any other circumstance but here they really do detract significantly from the game in their astonishing crappiness), and it's disjointed union between smooth movement and horrible stalemates.