The best RPG that I have ever played and the best FF that I have played so far.
The story line was great and I definitely look forward to X-2. One complaint that I have had with game developers over the years is that they suck at creating endings for games. You spend all this time beating a game to only have the credits roll or sometimes worse. The ending for FFX was fantastic and well worth the time it took me to get there.
I really loved the sphere grid way of leveling up your characters. It really made you concentrate on leveling up each character so that you could at least get them their minimum abilities.
The battle system was great. The only minor issue that I had was that it could be hard sometimes to figure out whos turn it was. Very minor though.
The sound and graphics were phenomenal and definitely show how far RPGs and Square Enix in particular have come.
I have to be honest, I have never been a fan of the side quests. Luckily you do not have to complete them all. A few of them were fun, but the Blitz Ball was annoying and not really worth the time and effort it took to learn it.
In the end, the game was fantastic and definitely one that I would recommend to any gamer, whether you like RPGs or not. Get it and Play It. You will be sucked in.