I think the general gameplay is fantastic, combines the best things of gears of war 1 and gears of war 2.
Although my only gripe is with the story, gears of war 1 was big, 2 was bigger, finding out about the Locust underground hives and everything.
But I that 3 just kinda ended, lot's of things still left unanswered, and that's that. Shame really.