Less seasons is always better, if you ask me. I don't believe any TV series actually benefits from having 10+ seasons. You see shows like Grey's Anatomy that just seem to never end and you question why it's still on the air because the quality of the show has drastically decreased.

I think the actual perfect amount of seasons a show can have is 4 seasons. I think you can tell a complete story that doesn't falter and doesn't get too bloated in a good 4 seasons. Hell, if you want to extend it, I can be okay with maybe 6 seasons. But once a show starts hitting 8+ seasons, I'll most likely check out. By that point, most shows are repeating storylines and aren't doing anything narratively creative or worthwhile, especially if they are network dramas that are hitting 22 episodes a season.