I was going to come in here and say "no" but then I thought about it and realised I was thinking purely as a webmaster. With my user hat on I think I'd have to agree that my results have improved.
I mainly search for techie stuff and I see less of the crappy 'ask-a-question-answer-with-my-link' sites and those really annoying Q&A sites where you have to scroll past a thousand ads to get the answers. With shopping I generally know where to go anyway these days I guess so I don't search as much on that stuff. Might search for a price comparison every now and again but again I probably go straight to Kelkoo.
Overall I tend to want genuine user opinions and reviews rather than commercially-biased stuff and I'd say overall I'm getting that better than I was. Not sure if that's Panda or just plain old evolution though. There is still some rubbish in there but that's a never-ending battle. Rather like hacking: put up a new barrier and it's only a question of time before someone gets round it.
Edited to add: some of this may be down to my own search techniques evolving of course...hard to quantify really.