Kingdom Hearts (the series as a whole)
- 1 is story heavy
- Chain of Memories (and Re:CoM) is a great step away from the traditional JRPG genre...though it can get kind of grindy if you're a perfectionist
- 2 is battle heavy and (in my opinion) not as good as the first one
- 358/2 Days is very fun and revisits the CoM concepts in a much the same way FFXII revisited the FFX Sphere Grid. If you didn't like that transition, you probably won't like this one either.
- I haven't played Birth by Sleep, but I've heard it's bad. So I don't recommend it.
Final Fantasy
- My personal favorite is FFV, followed closely by FFXII. It is occasionally a toss-up which one I prefer.
Disgaea
- If you have a PS2, find these games and play them. Now. It's EPIC. There are 2 main entries, a port of the first to the PSP and a PSP exclusive featuring the exploding penguins from the main entries. Play them all.
.hack//infection series
- All I know is that the first one is quite fun. I haven't been able to track down the others yet.
Prince of Persia
- Sands of Time is better than the sequels, but the second and third in that particular saga are fairly good too.
The Elder Scrolls
- Morrowind is infinitely better than Oblivion. Just trust me on this one, you'll enjoy it a lot more, even though the graphics aren't all that good. *wishes he had patch for improved graphics*
Neverwinter Nights
- Fairly good, very D&D-ish though.
Fable
- Play this. I know, it's not the best game ever, but it's amusing enough in it's own way and can keep you occupied after your seventeenth ragequit on Disgaea...before you go back, anyway.