1) The UI is incredibly confusing. It, again, feels like it's just a windows machine with some goofy /thing/ bolted to the top of it. It reminds me of windows media center.
2) At least the one we got was really heavy. Heavier than a macbook air, which is a "real" computer.
3) We all-too-frequently seemed to get dumped back into a standard windows desktop with a startbutton and everything...which would be great, if it functioned that way. All I wanted to do was create a PPTP connection on the thing, but absolutely couldn't figure out how to make that happen.
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I am fairly far from an apple fan, but the reason that the iPad has been so successful is that apple designed it from the beginning to be a new device with new UI paradigms.
Android did the same.
Microsoft, at least from the experience I got with surface, absolutely did not, which is sad, because they're easily poised to be able to dominate tablets.
The "holy shit" dream scenario that I have, and I think it's shared by a lot of tablet users, is a tablet as a detachable auxiliary monitor that I can dock applications into.
If I drag, for example, a browser window over to my surface monitor, that surface monitor should be able to get picked up and go with me, and then I should be able to dock that back into my desktop and go back to working there.