I agree on the maps part. I would like to see some different areas, and it can easily be supported through the lore. Restricting us to Grand Companies is...well, I'm 50/50 on it. I understand why they did it, but it goes in the face of how they've tried to integrate players as much as possible. I actually had to switch GCs to play with some of my friends, so I lost all my benefits. And even then, not all of us could've ended up together. I think linking PvP to GCs is something that should be removed.
As for the glamour system, they explained the reason for this. They don't want, say, Warriors glamouring Dragoon gear on and ending up with first-time MMO players in a lower-level dungeon because it might confuse them. Next thing you know, we'll be seeing Dragoons trying to tank for us. I think it's a rather legitimate reason, especially considering how many players I've seen that did not understand why they needed soul gems in level 35 content. Not saying that I wouldn't like the option -- in fact, I would -- but I see their reasoning.
And for the potion cooldowns, well, any less than that and you wouldn't need healers as often.