Oh, man. Where should I start...
-Top-Down perspective ala Diablo/LoZ:aLttP
-Class system similar to Ragnarok Online
-Level system similar to the Oblivion levelling mod/Dungeon siege
-Complex story that starts simple then vamps up
-Gameplay that starts off simple (ala Diablo/LoZ:aLttP) but gets more depth as the game is played
-Good learning curve for ease of adoption
That should, uh... Sum it up.
The BuShA owns all!