My biggest gripe about Gunz is that it felt like I was going nowhere. My friend and I played for about four hours, did well, and didn't have nearly enough cash moneys to buy, well, anything.
I don't think it should be as quick as, say, Counter-Strike, where you can get the most expensive gun in a handful of rounds, but when you play for an entire night and feel like you've accomplished nothing (being unable to even get a second stinking pistol), what's the point of continuing?