This isn't a comment on the Surface since I don't have one and aren't likely to get one, but more on the Windows 8 store, which on my desktop has been TERRIBLE. since launch I've managed to get two apps and I've had 15 or so updating at a glacial pace. It's been slow, apps will partly download and then not install, others will just sit in the queue.
Three weeks later I still have four apps that haven't updated.
(Totally off topic but the wireless support for my desktop's card is bordering on unusable.)