First person Maplestory.

Imagine if you were forced to play Oblivion or similar in first-person mode the whole time. That'd suck, right?

Oblivion does have a third person view. It is abysmal compared to the first person view. Oblivion (or heck, the entire main Elder Scrolls series in general) was made for first person. I have a very hard time aiming with a bow and spells in third person (And I'm a PC user. I shudder to think how difficult aiming must be on a 360 or PS3).

Since hitboxes do not appear to be designed very well in some cases (you might have to aim TOWARDS THE FLOOR in order to hit a flying Imp), third person can be difficult for melee characters too.

The animations... Walk off a reasonabily high ledge (which happens nearly 50% of the time in certain regions, especially east Leyawiin and the entire mountain range around Bruma and Cheydinhal), and it looks like you're running on some falling invisible treadmill in mid-air until you hit the ground.

*shudder*

Note that I am not outright saying that Oblivion is a bad game. Oblivion is quite enjoyable if you're willing to put the time into it despite the myriad of graphical weirdness/glitches it seems to have.

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That said, I also think that 3D and First Person is a bad idea for Maple in general. In order for something like this to work, there's going to have to be some restructuring on how certain things work, especially skills involving teleportation and jumping.

More random thoughts...
- Avoidability will probably be less useful, since you can likely just dodge attacks manually, though Avoidability might be used for some 'last second avoid' mechanic or something. Same thing applies to Accuracy.