Hmm. Interesting. Definitely sounds like a driver issue, which is the plague of MS upgrades. No one's ever ready on time.
I've seen this with some systems in Win7 (until the drivers caught up) and Win8 as well. My main system seems fine at this point, but Intel controllers are very common and I'm not surprised that some thought may have gone into the driver by now. I've seen some sketchy network performance, but for the most part, everything seems fine. Driver issues usually sort themselves out in a short enough amount of time if you're using popular hardware. I reinstall my OS enough that I wouldn't care about going back to Win7 in the interim, though. I suspect you're probably in the same boat.
With respect to the UI, yes, people did have a problem with it. People have a problem with UIs when they change because familiarity is a big part of confidence when it comes to using computers. I had clients refuse to upgrade to Server 2008 because of the UI (because UI matters on a server, right?), and it was the same with XP -> Vista, 2000 -> XP (even though they could just use Classic), 98SE -> NT/2000, etc. etc. etc. In general, if you're the kind of person that wouldn't even understand how to post on a forum like this, change is Bad. Some of my clients are these people.