Mine would be during the decade of Superman/Doomsday storyarc.
Metropolis (via Brainic attack) becoming the City of Tomorrow, and Superman stood for Truth, Justice, and the American Way, the Big Blue Boy Scout.
The stores were great.
The artwork was great.
Comics came out weekly (over four titles with superman ‘shield’ displaying the sequence number – not the issue number), so we knew the order to read them. Unlike alot of crossover events/stories where if you where luckly to get a #1 of 8 of story XXX on the cover.
The new 52 era was bad.
The Bendis era was bad.