CSS3 has no problems other than a user's crappy browser. Speaking of crappy, I've monitored my slow shared server's resources since I implemented CS3 and have noticed a huge drop since I started using CSS3. While CDNs like Cloudflare works for awhile, my shared server doesn't seem to be jiving well with it and Cloudflare has problems of it's own. CSS3 gradients has been a savior to my site.
Besides being inspired to create new skins I also wanna make CSS3 versions of all my existing skins. I started work on them last night. Some of them will probably look a little different from the original skin though. I don't ever want to make another skin that uses only gradients and images again. That would be lame after experiencing the awesomeness of CSS3. Plus with the resolution of monitors going up, image files are starting to look more blurry than ever. I experienced that when I looked at both xenforo forums and my own site last month when I went to Best Buy to check out the Macbook Pro w/ Retina.
Another thing is that I now have a new found appreciation for the current designers like Shelley and Forsaken who do a ridiculously awesome job with it and have even tried to give me tips in the past that I was just not comprehending or willing to learn at the time lol. The different configuration options the CSS3 generator gives me makes me appreciate their work now because I know it ain't easy to make something look good when you have that much flexibility and large room for error.