Heroes was not the first sci-fi show to get cancelled, but it was one of the first I can remember where there seemed to be a collective sigh of relief when the moment came. Nobody would dare say the same of, for instance, Firefly.
I never made the connection between Firefly and Heroes like this. Make you wonder, imagine a version of our universe where Firefly wasn't cancelled, and went on for four seasons and went down the drain..
Maybe we should regard Heroes the same way we do The Matrix or Star Wars. Both the Matrix sequels and the Star Wars prequels are 90% banned from my memories and aren't real movies of their respective franchises. Maybe I should look at Heroes the same way. One decent season. And a few forgotten ones.