I've been doing a fair amount of illegal Windows 7 testing since the first beta leak. Strangely, I was quite impressed with Windows 7 beta. I thought it was a fluke, because it actually OUTPERFORMED Windows XP in gaming and big file transfers. I couldn't believe it! I looked up online and people were getting similar reports. I finally thought "It's about time they got better than their previous OS", and I was looking forward to the final.
And then Windows 7 RC was released. I installed this over the beta, and wow...completely different. I went from having better performance in network file transfers (large and small) and better fps in video games, to the exact opposite. I didn't bother with Vista, so I couldn't tell you how it rated with that, but it was not only slower than the previous beta, but slower than XP. Talking about putting out any excitement you had for the OS. I'm HOPING that what they added was just some bloatware to track bugs...because I wasn't the only one excited about Windows 7 (pre RC)