Season 1s are great, setup, some payoff, a bit of lead into the overarching story. Then season 2 to X. The heroes win and then lose in the final episode, cliffhanger to next season. People get bored. Final season is announced and they wrap up the show.
I think it’s for the best. Too much money in the US is spent on bullshit.
In any case, US versions of British series are almost certainly worse.