Having just come off of playing Uncharted, a game which I felt had a beautiful setting and good story but mediocre shooting, I now find myself playing a game with those strengths and weakness reversed. The gunplay, while not much different than Gears 1, I'm finding to be head and shoulders above that of Uncharted. In fact, the aiming and cover in this game might be a little too good (or perhaps it's just that the enemy AI hasn't been too great so far). Halfway through Act 2 (on Normal difficulty), and I haven't died once. The only times I've ever even come close were because I was being completely careless. One good thing I'll say about Uncharted, the bad guys made an effort to flush you out of cover. Here, not so much.
The other big issue I have with Gears 2 so far is that the levels drag on way too long. Act 2 starts you off in an underground cave, which you'll get tired of looking at a couple chapters in.