I finished the JP X360 version tonight. Took me 33 hours from start to finish (perfect length for an RPG), but I did no grinding other than the first six missions on Gran Pulse (that took about an hour). The later boss fights were a good challenge - not too hard, not easy. 'Easy mode' really makes this game fantastic because you don't have to deal with the grinding BS but you still need strategy and (some) proper equipment to beat the game.
I've played FF2 (SNES), FF6(SNES), FFXII, and FFIII. I only finished 6 and 13, the other two were a bore. I think I like 13 a bit more than 6, so I guess it's my favorite FF game. Wow. Never thought I'd say that.
But really, I enjoyed this game a lot. It stripped out all the annoying crap from JRPGs, streamlined everything, but had a really addictive, fast-paced battle system. I liked most of the characters (especially Fang and Lightning), and while the story was the same old cheese, it was still fun. It's also pretty much the only JRPG I'd rather play with English VA.
A couple things I didn't like:
-Most of the stores/inventory were completely useless. I didn't buy a single thing until right [spoiler]before the last boss, when I bought two cherub crowns[/spoiler]. After that I had 40K+ in the bank still.
-I prefer getting stronger weapons instead of upgrading the initial weapon to different tiers. When I found a new weapon in the game, it was completely underwhelming and I used NONE of them.
-I don't like how [spoiler]the crystarium can only be maxed out post game[/spoiler]. I never do post-game content, total waste of time IMO. There are a hundred million other awesome games out there to play, when I finish an RPG (and when the credits roll, it's finished), I move on to something new.