Johnny Novgorod said:
Hold your horses, I know of http://www.co-optimus.com/ and that "recommend me co-op games" is a recurrent thread. I already came up with a list of games I'm interested in, I just want your opinion about them, specifically regarding whether they have good (couch/offline) co-op or not. I'm willing to buy a nominally mediocre game if the co-op makes up for it.
Borderlands 2 (already have 1 and I like it, does 2 do anything differently?)
Diablo III
Dragon's Crown (personally I'm leaning towards this, I like shared screen co-op)
Far Cry 3 (actually the game looks attractive enough to get on its own, but I was wonderin about the tacked-on co-op)
Little Big Planet (looks fun, but is it fun?)
Portal 2 (I heard it's very brief and doesn't offer a lot of replay value?)
Resident Evil 6 (I played RE5 on co-op several times and liked it. I've heard a lot of shit about RE6 but nothing specifically co-op)
If you can think of any other good couch co-op games on the PS3 you're more than welcome to bring them up though I'm a little weary of FPS (which seem to be the most popular option).
Borderlands 2: No, it doesn't do much differently. Me and my friend ended up with Borderlands fatigue when we got to it after finishing the first one. So I personally wouldn't recommend it since you're weary of FPS and have played first one.
Dragon's Crown: If you don't mind having to wait for your friend (and vice-versa) when he/she is allocating skill points, shopping, inventory check, etc. then go for it. You can't do those simultaneously, which can be a drag.
Far Cry 3: Just saying, unlike Single Player, there is no level-up system and no skill menus. So it just ends up being a generic shooter. I only played it with my friend just so I can get platinum trophy. When I found out that you don't need to finish the co-op shooter to get platinum, we stopped playing immediately.
Little Big Planet: I bought it because it looked fun. And turns out, it really is. If you're not so quick to dismiss the game because it looks childish, girly, or w/e, then LBP may have something for you.
Portal 2: I didn't find it brief. To me, it was more of moderate length. I had a lot of fun with it, arguing with my friend which direction we should take, sharing insults for not having precision, and high-fiving after we accomplished a puzzle... and such.
Haven't played RE6 nor Diablo 3.
Hope this helps.