It has some pretty funny moments (and witty dialogue, from what I could tell), and it's much longer than Paper Mario. The gameplay is much much better. My review is up at PGC and it extolls the wonder and glory that is Paper Mario RPG.
Drinky: Seriously, Paper Mario RPG needs your love. IS made the game "easily accessible", yeah, but it's made for hardcore RPG nuts at its finest, deepest play.
Also: Super Mario RPG sucks all seven flavours of ass.