I never played the beta, and I just finished my first day today(2nd day). I was not really enjoying it at first, but it's starting to get more comfortable now. The lag is minimal considering its a MMO release. I'm impressed. Also, the graphics are stunning; my only complaint about the visuals is the animation could be more elaborate at times, but that's not a big deal really.
In general, everything is smooth, but I do have one complaint, and that's we really need /sea, search functions, and/or AH. It just seems silly to not have 1 or all of these things at launch. AH I can understand not being added until later as it would be really jumpy right now anyway. However, I don't see why /sea and bazaar searches aren't in game.
That being said, I'm a glass half full guy, and I know SE will get around to making these functions in game, and tweaking them until they're right. Besides, on a positive note, the situation should motivate us all to try a variety of crafting classes so we can fulfill a lot of our own very basic needs. Oh and on another note, setting up an account on the SE website was a pain.
All in all, I've had a really clean launch by MMO standards, SE did pretty good in a lot of areas.