You can't really say. All three decades have their high points.
I guess the replies here are affected by the fact that most users had gaming "teens" in early to late 90's.
I agree. I feel 2000-2009 had the best releases personally, although I have extremely fond memories of the Mega Drive, DOS, C64 eras, because of the lust for some of the games then. But the best games were the 2000-2009 era in terms of story, awe and engrossing gameplay.
It's a tough one. I think games are better now than they've ever been, but the early 90's were my formative years. I spent many a happy night with my Amiga 500 and games like The Chaos Engine and Turrican 2 the latter having what I still feel is the catchiest theme music ever [yes]
This will be forever ingrained in my brain. Nostalgia. Its quite scary actually how far we have come. Only seems like yesterday i was playing my a500.