I really liked Mac OS X Tiger. It was a great OS and still is.
In fact, my brothers still use it regularly for Microsoft Office, iTunes, and web browsing.
I'm surprised some things still work with Tiger. Are the newest versions of the above compatible with Tiger?
System 7 because that was at the pinnacle of the OS
Snow Leopard rating so high is not surprising. What is surprising is that Leopard rates so low, and that pre-OS X operating systems rate so high (the nostalgic "good old days" factor?)
Perhaps Leopard is regarded as a very imperfect Snow Leopard. But here, even Tiger rates way higher than Leopard.