It's a mix of people who are nostalgic about FFXI (and wanted an FFXI with updated graphics) and people who are WOW-phobic.

Yoshi-P said when he joined that his plan is to modernize FFXIV by looking at what made western MMOs successful, that's literally what he's done, and that's what these people are complaining about. A modern MMO that has a few things in common with WOW.