Monster Hunter: Freedom Unite has got to be one of the greatest games on PSP.

My Top:

- Final Fantasy Crisis Core (Best overall)
This game's story is just incredible, and my all-time favourite video game character was decidedly Zack Fair after playing it. 'nuff said.

- Tactics Ogre Let Us Cling Together (Best turn-based tactics game of all time)
This game's story is pretty awesome too, but what really sells this one is the outstanding gameplay. Further, you don't need to start a new game, or even a clear data game to visit all the different routes. You can simply go back in time (yeah that's right time travel bitches) and play every route.

- Final Fantasy Tactics: War of the Lions (Good turn-based tactics game)
Again, great story, fun gameplay, not up to par with Tactics Ogre LUCT, but better than most other tactics games out there.

- Kingdom Hearts Birth By Sleep (Great Action RPG for psp)
Absolutely fantastic. Combat starts off a little slow early on due to lack of early game skills. However, as soon as you can get a hold of some good skills and start crafting skills, you will have AWESOME MEGA FLARE BOMBS AND LIGHTS AND SHT GOING EVERYWHERE. Annnnnd Kingdom Hearts, so play it.

And whoever said tactics ogre is like disgaea, gtfo. Don't get me wrong, I love both series, and they are both fantastic. However, they aren't similar at all, except that they are both turn based tactics games. Unless that's what you were implying then YodaSnipe gtfo.

well... le me check
Final Fantasy Type-0 (even I don't understand it languange xD) and the other FF series like Dissidia, Crisis Core
Fate Series (Unlimited Codes, Extra)
.hack//link :p
and God Eater should be worth

Valkyria Chronicles II
Give us the third game already, goddamn!