Yeah, as for controllers, you might want to just hunt down brand new controllers. Some games have VERY precise controls(not sure how else to word it)with the analogue stick, making it so you're character will constantly want to move. I've been using one of my controllers that does this, with my Playstation TV, as a lot of the games I play on it, don't usually need super precise controls.
As for games, you said RPG's(your definition of RPG may vary), I'll give you a list of games to check out, even if I haven't played thru them among my backlog:
3D Dot Game Heroes if you like Zelda'ish games, twas' my first PS3 purchase it was!
Dragon's Crown, Action RPG'ish, fun game
Dragon's Dogma, Action RPG, I have it, heard it's fun, but haven't played it yet
Dungeon Siege 3, Action RPG, some put it down, I really enjoyed it
Fallout 3 & Fallout New Vegas, Action RPG's, I had a lot of fun, but the bugs can be flippin' annoying, might be less buggy on PC?
Final Fantasy 13, there's 3 of them(part 1, part 2, & Lightning Returns), I haven't played them, but if they're your thing, they're probably fun for cheap
Legend of Heroes: Trails of Cold Steel, it's Falcom, they rock, I'm sure it's fun, but haven't played thru it yet
Lord of the Rings: War in the North, Action RPG, supposed to be pretty fun, once again, another game I need to get to
Marvel Ultimate Alliance 1 & 2, Action RPG'ish
Nier, some people swear by it, haven't played it yet
Ni no Kuni, see above
Ragnarok Odyssey, ditto
Star Ocean 4, ditto, some don't like it, but it may get a bad rap
Suikoden 1 & 2(PS1), if you haven't played these games, do so, I LOVE them, it's my 2nd favorite series ever just below Ys
Tales of Graces f, Tales of Symphonia Chronicles, Tales of Xilia 1 & 2, several games in the series on PS3, I believe they're all by former Wolf Team members, lot's of people swear by these games.
Trinity:Souls of Zill O'll, Action RPG, supposed to be fun
X-men Destiny, see above
As far as adventure games, the Tomb Raiders & the Uncharted's are all great IMO.