It's occurred to me that there isn't a general "what we all think of Beta so far" topic. So, here, have one!
I love the visuals and the environments/maps. The UI is growing on me very quickly, although I still wish I didn't have to hover my mouse over something in my inventory in order to see what it is. I'm still 50/50 on the battle, crafting and gathering systems but I'm sure they'll grow on me in time.
Questing is a bit annoying after a while, but I suppose I've only done the low level stuff so far and it's a great way to get to know the various areas, points of interest, NPCs and functions/features. I really look forward to getting into big parties with everyone from EoFF most of all! I want to help the new folk power up their characters to L30 or so as fast as possible so we can all party up in random areas.
I like what they're doing with Free Companies, too. I'm really excited for the housing. I have 1.5m gil on my character and I fully intend on most if not all of that going towards our Free Company housing. I think I'll get a massive, gorgeous house in Ul'dah (since I'm with the Immortal Flames) for the Free Company and then I'll get my personal housing in Limsa later on.