Not very impressed with the One so far, but I'm willing to reserve judgement until E3 at least. I know it was a hardware announcement, but the reveal seemed way too focused on TV and the stupid Kinect stuff.
What's bothering me is the lack of support/possible fee? for used games. Used games are usually the only way I can afford to play games, period.

EDIT: And right after I posted this I saw this blog post:

The ability to trade in and resell games is important to gamers and to Xbox. Xbox One is designed to support the trade in and resale of games. Reports about our policies for trade in and resale are inaccurate and incomplete. We will disclose more information in the near future.
Yay! Looking forward to hearing that. Hopefully it's good news.