How many people here who are providing an answer have actually used Windows 7? I would go out on a limb and guess that the answer is "very few", especially given the sort of comments that people are making.
I was sceptical at first, being a die hard fan of WindowsXP and loving how stable and lean it is compared to an OS like Vista. I have been using the Release Candidate of Windows 7 Ultimate for about 3 months now, and I was so impressed with it after the first month, I pre-ordered the Home Premium version for £60 and have it here now.
Unlike Vista, I had no hardware compatibility issues with 7. Not only that, but after startup, Windows 7 has a very similar memory footprint to XP, which is amazing considering how much more modern and refined it looks. For a software company to bloat and then shrink the software like that is quite remarkable.
I would liken Windows 7 to XP in much the same way that I would liken Vista to Millenium Edition. The failed versions are a stepping stone. A place where Microsoft experimented with new ideas but got caught up on the execution. XP and 7 represent refinement from what was learnt and the feedback that was received. So yes, I would say that 7 is better than Vista for sure, and at least as good as XP only much more intuitive and a hell of a lot prettier.