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I loved 3 and 4. I really wanted to like 1 and 2, but I have just had a hard time getting into them.

I really hate the card/negotiation system in 2. As a side if you haven't played SMT:...

I think the themes are good, but 7 probably has the best.

Baron

The last dungeon is my favorite in the game. Interesting enemies and the "Ultimate Weapons" combine to make it fun.

Bahamut's cave is pretty cool as well. Behemoth *shiver*