I don't watch that many shows anymore and I watch even less finales. I can't even remember the last one I watched.

I think there's a little human nature involved and it's very difficult to write and ending everyone is satisfied with - any show that people get emotionally invested in is going to feel a little incomplete when it ends

Not too many, since I don't watch that many shows and I feel pretty satisfied with the ones I have seen

Once or twice I would guess. I am not so sure about the twice but I'd say twaiß