I just finished playing this earlier this week :p Not a bad game, and I actually liked the slow battle system for some odd reason, but I think it wouldn't have made any sense at all if I hadn't played Episode 1 beforehand. Also, since it's part of a trilogy, the ending was disappointingly anticlimactic, and I'd say you really need to play all 3 to see the full story in all it's glory (though I've not played 3 yet :D )
As ed said though, the voice acting in the english version is a bit bleh for some of the characters, and at times, I think Shion's is comparable to Yuna's from FFX US, it was that cringeworthy :p