I wonder if Blizzard has a weekly meeting to discuss how best to piss off their customer base this week.
I can just picture one of those meetings:
"You know what would really piss them off? more wallpapers"
"AHAHAHAHAH YES let's do it!"
"Oh and let's tell them nothing from the beta will transfer over but then.. ACTUALLY give them a feat of strength. Wouldn't that be hilarious?"
"Yes! make it so!"
They weren't intentionally pissing off their customer base. Players specifically asked for this, for months now, and Blizzard gave it to us. Anyone complaining about this is a huge baby.