I think the last games where I thought "wow, this feels different, how come no one had this idea before" were Portal and Mark of the Ninja.
Of course, that's not to say those were the last games to impress me, hell no. But I think they were the last ones that, to me, felt truly different. All other great games are fantastic because they effectively mash a bunch of elements we've already seen before.
On an industry this old, it's extremely hard to come up with brand new, innovative ideas, so I find very unfair when people complain about "the lack of innovation".
Since the shift to 3D, games are about being evolutionary, not revolutionary.