Probably can't get more seemingly-generic-yet-freshly-fun-and-addicting than my entry, though I should note now that in terms of real-life-worth, this is nowhere NEAR in the same league as Spec-Ops: The Line.
PAC-MAN Championship Edition DX+.
Yes, it's Pac-Man. It's the same Pac-Man that we know, at least that's what it looked like (for the record, I'd never heard of or played the original Pac Man Championship Edition from 2007). What made me download the demo was nothing more than the ability to play classic Pac-Man with flashy rainbow/neon colors and rockin' techno music. I didn't get that. Well, I did get the flashing colors and rockin' techno, but for the game itself, what I got took the basic Pac-Man outline and crafted a fast-paced arcade-action game that in my opinion really breathed new life in this franchise. That convinced me to spend 10 bucks on it.
I would highly recommend it, especially if you haven't played any (proper[footnote]I love Pac-Man 2: The New Adventures for the Genesis, but despite that love, I fully recognize that it's not a Pac-Man game at all. I also don't recommend it for most gamers, even retro gamers whose primary play pool consists of games from its era. Watch PushingUpRoses/PeanutButterGamer's Let's Play of it and you'll see why.[/footnote]) Pac-Man game released after Ms. Pac-Man.
If you want something less recognizable(or just some more variety), I also recommend a 360 launch title: Kameo: Elements of Power, produced by Rare. It looks like a generic kids' action-platformer on the surface, but to me, it's quite a deep and interesting action-platformer-beatemup. The eponymous main character, a fairy-elf princess, has the ability to change her form to 3 creatures(called "elementals") with the push of a button, selected from a pool unlocked one by one as the game progresses, in order to solve various problems (from a fire-breathing dragon and a rolling armadillo-type creature, to an ice-spear-chucking yeti and a boxing venus fly trap[footnote]The boxing flower ALONE justifies the price of admission far as I'm concerned.[/footnote]). The game is also GORGEOUS. In my personal opinion, despite having roughly the same graphical prowess and being released almost 2 years earlier, Kameo looks far more beautiful aesthetically than Halo 3, largely because its use of color and stylization meant that it didn't need to constantly shove bloom all over the place.
Sure there's problems: some segments of the game feel out of place and some of the beat-em-up segments seem unnecessarily padded. The controls also sometimes feel like they could have used a wee bit more polish. But these don't ruin the game for me at all, especially since out-of-place segments, some unnecessary padding, and somewhat unpolished controls were also present in Banjo-Kazooie, one of the most fun and joyous games of all time.
Seeing as I've never seen anyone even mention the game, even back then, Kameo is MY Psychonauts/Beyond Good and Evil.
Oh, and yes you read correctly, the main character is a PRINCESS. And even when not transformed into a creature, she can land a really satisfying flip-kick on her enemies. AND she's got some kick*** warpaint. If you've seen some of my other posts, you'll know why that makes me smile. ^_^