Wasn't it supposed to be an anthology series, where each season was a new cast? But then they were like "hey everyone loves these characters! Quick make up some stuff so they all have to stick around." Then we got weird shit like that character who has a bunch of twins or something, and psycho serial killer Syler joins the team.
I think the biggest thing I remember killing it was that there was a writers strike halfway through the 2nd season and instead of waiting until the end of the strike, the show runners slapped together a shit ending for the season and then it never really recovered
It moved from more a spooky sci-fi to a drama that killed the interesting new character every episode. That's gotta be one of the most disappointing series after the expectations set from the first season.
Hollywood must really suck at business if they can't keep their essential workers from going on strike every decade or two and taking down a bunch of good shows when they do. Seems like it would be a lot cheaper to just, you know, pay them.