Here are my PS3 recommendations.
Yakuza 4- I haven't finished 3, but I think 4 stands as a good entry point. Mostly because you are introduced to 3 new characters and a story that while having some small ties to the previous stands on it's own. Regardless, the game is awesome. Really fun beat-em up gameplay that's pretty simple to get into with a story that is pretty crazy, but has you know heart!
Valkyria Chronicles-What can I say? It's just a charming game with pretty cool srpg/third person gameplay. it's really the game you want Japan to make these days.
Sengoku Basara 3-A Dynasty Warrior's clone with style and humor. That sense of personality adds a lot to the simple and repetitive gameplay. Pretty fun and zany.
Uncharted 2/3-Yeah they are your super cinematic action games, but they are good for what they are.
Infamous 2-The first one sucks, but this was such a super improvement. I don't really think any game comes close to the sense of awesomeness that this game gives you during world traversal. It also doesn't look like shit, unlike the 1st one.
Gundam Extreme Vs-Just a really fun arcade mech fighter.
These are about all the exclusives I think are worth a damn. You non-exclusive stuff like FFXIII, MGSHD, Vanquish, Catherine, Castlevannia LoS, No More Heroes, Resonance of Fate, and Asura's Warth that are pretty good and may be better on the Ps3.