Doesn't disappoint - couldn't find a single flaw.
Gameplay: 10/10 - The combat system didn't really get boring to me. With all the twists and turns to it throughout the story, I hope you won't either.
Graphics: 10/10 - Flawless style.
Replay: 8/10 - Once you play through it once, you may not decide to play it again...but the game itself is so vast, it's pretty hard to get 100% to complete it, so it'll last a while.
There may be no online, but hey, suck it up, it's a freakin' Gamecube, a classic!
Overall: There's just no reason not to get it. Instant classic that I'll always remember.
Check out the other Paper Mario games, too! The first was almost as good as this one, and the third's good too (just not as good)