Final Fantasy 14: Dawntrail released into Early Access last week, and while its servers have miraculously (bar one brief hiccup) held up, Dawntrail's reception has been decidedly divisive so far.
First off, the expansion has "Mixed" reviews on Steam. I don't think this is an indication of anything, though, since said reviews are only 600 strong, and FF14 has many, many more people playing it. The only real takeaway you can pull from this information is that, well, very few people bother to review FF14 expansions on Valve's platform.