If you make it a sidescroller like JJ2, it would be interesting, though it better be greatly different from MapleStory or it would lose the charm and wonder a unique game has. If it was just a generic top down RPG like Everquest or such then you REALLY better make it different or else there wouldn't be much point. I do think it would be interesting if it was side-scrolling and gave a higher degree of movement (higher jumps, faster walking) then other MMORPGS. Then you could make it so health values are lower then the norm and put more empthasis on manually dodging attacks then just taking them.