Its gorgeous to look at, the sound effects when you summon something with your launch power is always cool, and the story's engaging. Easily Remedy's best game.
Infamously buggy mess at launch, but now its one of the best RPGs ever. I got so cut up by what I did to one of the main NPCs that I deleted a 70 hour save out of remorse. It takes a lot to elicit that kind of response.