It's not FF14's smoothest launch for sure (smoothest one was 5.0, and 3.0 wasn't that bad as well), but it's absolutely much better than the horrendous disaster that was 4.0 early access.
People cry about 1 hour queue, yet I remember Rauhban duty issue that would kick entire server at once and welcome player into 23k+ queue where you would sit for 4-6 hours with the hope of not being kicked from lobby because it would mean starting from scratch.

All things considered, I think 1st day was as good as it could possibly be with current servers's state that wasn't exactly perfect prior update either.