You can definitely blame this on the majority of the beta testers. I was one.
While there were plenty of other problems with the beta test itself -- abysmal build quality and unnecessarily limited playtimes were two big problems, the primary downfall was the total lack of direction from the developers and moderators. I brought up many of these same issues (particularly the UI mechanisms, as I'm a UI guy professionally) on the beta forums; a few posters agreed with me, but the majority of the replies came from slavering, rabid fanboys. These idiots took umbrage at mild suggestions or observations -- to say nothing of real, rigorous, and honest feedback -- and essentially drowned out anything useful. The most commonly repeated aphorisms were along the lines of "It'll be fixed by launch" and "How dare you suggest that anything Square produces is less than perfect."
Given that not a single one of the issues I brought up appears to have been fixed, it appears Square listened solely to the yes-men. It's also plausible that they really didn't learn anything from FFXI, as others are saying, but they did at least solicit user feedback this time.