There are always problems with new OSs, and people like to talk more about what's wrong.
Yes, there are issues, but yes, SL has been working great for many people as well. If you're still using Tiger, you can probably wait a bit longer for, say, a 10.6.1 update. But seriously, why would you? Coming from Tiger, this is a superb change, despite a few bugs that'll be fixed in the weeks to come.