Lots of hyperbole here, as always. My anecdote is as good as your anecdote. We were there for a week over Christmas, so you know it was busy.
Everything worked great, rode a ton, never waited more than 15 minutes for anything (except breakfast at Sleepy Hollow, man, that was a long line). All five magic bands worked great every single time we used them, no one dehydrated from waiting five minutes to get a drink refill (and we also didn't have scumbags with two-liter bottles holding us up, either), everyone got into the rooms quickly, everyone made multiple charges using their bands, etc, etc
While my example doesn't mean the system is God, this bad day (or yours) doesn't make it the devil, either.
I don't care one way or the other, btw, because we rocked the old system and we've figured out how to rock this one. I suggest everyone here do the same.