Name a show (or shows) that peaked with their first season
They could've even had good later seasons but never reached the heights of the first season.
I'm finally watching Westworld post season 1. While the seasons are not bad, they're just not that engaging. That first season is just one of the best things ever put on TV (in my opinion)
Another one is Heroes. Man, that first season was a phenomenon. "Save the cheerleader, save the world"
They never recovered after the writers' strike of 2007/08.