I am an explorer combat type of player when it comes to any games even more so for an mmorpg. So my greatist worries always revolve around that.
A) They talk about a huge world and it always changing in some way shape or form, but will there really be enough to explore or will most the world just be "open flatland" with little things here n there. And even is there is a lot, do they feel unique or is it just another cave in an other spot.
B) Is combat any good? Does not have to be Super fast pace like Vindictus, but it has to be alot better then something like Skyrims slow repetative combat was. Need real skill based combat like they say, not just 1 sword swing over n over n over.
C)After being reborn yes your stats start over, however lets say I was master in some form of combat, if I am not there yet again for gear/skill level, can I still fight 1v1 against someone who is? Not saying that gear cannot help in combat, but a skilled player should be able to take someone on who's stronger "level/gear wise" if the skill level is that different.
Just because a game says yes at some point in development, doesn't always mean the finished product means yes.
Those would be my top 3, but I could make a list of much more for this or any game.