Personally, I've had fun during the time I've been on. At first the UI was verrrrry laggy and I thought it was a bit of an issue. I don't think its much of an issue for me now. It's gotten much less laggy for me and I no longer have to wait around for my levs to activate anymore. It seemed like I had to stand there for several minutes before the lev finally activated after I invoked my guardian aspect.
There is still a bit of lag recently during a heated battle, but I can deal with it until they get it fixed. Overall, I'm still very excited for the impending release. I wish people would stop expecting the game to be PERFECT right at the beginning. If you played XI during the NA release, you'd know that it's been changed much since then and that SE has listened to what people want and truly did try to fix it. It does take time though. I know it's cliche, but Rome wasn't built in a day..... It XIV has a lot of potential and I think given a chance, it'll be what everybody is expecting and more.