Mine does it as well. I figure there is a software fix eventually. I'm not going to exchange mine over this. Everything else works just fine and I feel that the chance of ending up with the same problem in another machine or worse, other issues that could be really bad is definitely not worth the risk. It's not that big a deal. With the super fast boot time, I don't mind turning the thing off. Seems like I've always had wake from sleep issues with past Macs. It just doesn't bother me like other folks, I guess.
As for the aforementioned chance of a power surge, in 24 years of owning Macs (and a pc or two) I've never, ever, had a power surge of any kind damage a computer. That's what surge protectors are designed to protect. In any case, I have it on a high end UPS/conditioner/surge protector.
While I'm not especially pleased, as long as I can sleep at night, I don't really care if the MP doesn't. Or if it ever does. So long as the damn thing starts up in the morning and runs ok, I'm happy.