I don't get all the negativity this card is receiving. It performs on par with last gen parts a tier above it such as the 390 and 970. It also destroys the 960 and 380. This is what I expect for a new GPU. Chase the previous gen one tier higher, and beat the last gen same tier cards. The 960 was slow, the 380 wasn't a huge leap from the 280, but this is different. If you have an older card such as a 7850, GTX 760, or even a 280X, this thing is a solid upgrade. Hell, it's a solid upgrade from a 380X or a GTX 770 even. View it for what it is, a solid mid range card using a smaller, cheaper die, not a flagship part with a massive die. A 280X still holds it's own at 1080, and the 770 seems to be holding on too. But the 480 is a definite upgrade from either of those cards.
As far as the power draw, there have been plenty of cards that ate more than 75 watts from the PCI-e slot with nobody complaining. The 960 was one of them as were a few 950's. The 960 was known to spike up to over 200 watts at times, surely drawing more than specified. The gaming load tested was also Metro at 4K, something no mid range card can actually run. It must have looked like a powerpoint presentation. I wouldn't be at all afraid to slot one of these in my board, especially for 1080p at 60FPS. It can even handle 1440p decently. I'm quite impressed with it personally.
Looking forward to the 490's for sure.