Love the 90's in terms of popular media... when I think of my favorite games, movies, and especially music... the 90's keeps coming up. I even loved the early days of the 'net, when it was still a 'nerd' thing. I threw a 90's themed party last year and everyone had an absolute blast.
The 2000's were a pretty shit decade though here in the states. Terrorism, unwinnable wars, housing crash / depressed economy, rapidly growing inequality, 8 years of neoconservative control, the rise of minimal techno.
The 2010's definitely seems better on the political side of things but it also seems even more willing to mine nostalgia than previous decades so a lot of it doesn't feel 'new'. Apart from everyone's constant obsession with their mobile devices. I guess electronic dance music FINALLY breaking in America is cool, and it's also cool to see positive growth with regards to progressive social issues.