Windows 7 is pretty good, to me. It works, it is fast, I like the look, I love the logic behing the superbar and I would never give that up, now. I too tend to like it better than OSX dock. And, finally, the feel of solidity and responsiveness is gratifying.

I've been using 7 from RC as well. Then, last August, got my final release via Technet, and used it to upgrade my work machine, where I was using (happily) Vista 64bits.
So, my work machine is a Lenovo X200. Its hdd used to be in a T60, then a T61, now the X200. It's full of software of all kinds. Upgrade took forever (more than 2 hrs!), but was just fully successful. No issue at all since then.

My criticism to 7 is that it does not fully solve the problem of nesting some options and features too down in the layer / menu / windows / wizard structure of the GUI.

Other than that, I just like it.