The first problem I have is the worst one that I have found in the game. Do you all notice that we can't jump? Well if your wondering why this is a problem I'll explain this to you. All though you can travel instantly in this game, you can only teleport to that place if you've been there, so you do have to travel. So when you think you found a shortcut and you decide to walk up that mountain, you better hope its a valid path because if not you have to walk all the way back to the road, this is because the boundaries on this game are very strict. When you come to a dead end you begin wishing that you can jump off that tiny ledge to continue forward, let alone run off of it. This problem will become time consuming.
Problem number two revolves around the first sort of. Anyone who played in PvP should relate to this. I'll give an example using the Monk. Anyone who plays a monk in PvP will notice how the warrios run straight at them without a second though. Well any smart player is goiing to run, and in the process of trying to gain some distance you accidently run into a corner. This is a HUGE problem because all the player models have boudaries, this gives a sence of realism and adds some aspect of strategy, but when you get cornered you have nowhere to go, and because of the strict map boundaries you're not even allowed to jump out of that spot let alone jump in the first place.
C

Fingers in their eye sockets and all that 