I think the 90's had some of the best movies (T2, Matrix, Princess Mononoke, Jurassic Park), games (duh), electronic music (the stuff really diversified and branched in a hundred different directions, so many classic tracks came out of that era), rave culture (beats festival culture any day of the week). Though it did have some dodgy fashion (that whole trend of middle class white kids from the suburbs pretending to be from the hood), boy bands, nu metal, grossout humor. Or anything about Staten Island... seriously, going there is stepping through a time warp into the shittiest parts of the 90's. On a serious note, US economy was at its peak, wages were up, war was at a minimum for the first time in a while.
The 2000's on the other hand, was a pretty empty decade. I don't really reminisce about anything media-related from that decade, even preferred the neon 80's and wacky XTREEEEME 90's over the design style of the 2000's, where every graphic designer had a hardon for Helvetica and industrial designers copied the boring flat and rounded Apple style ad nauseum, even the music was getting in on the action with the rise of minimal techno (aka 'mnml'). And on a more serious note, the war on terror, housing crisis, poor economy, rise in globalization...
Anyways, apart from the majority of the 2000s, stuff I have no nostalgia for:
-Muscle Cars
-Spongebob
-Thundercats
-Oldskool hip hop, Tupac, Biggie and the whole east vs west war
-C64/Amiga/British computer gaming
-John Hughes films
-Goosebumps/Animorphs
