When the show dropped Sam’s demon powers entirely it definitely hurt the show in terms of quality for me. In that time period it set this show apart from the rest but after they got rid of the powers it felt like every soap opera just with monsters
The show was always meant to be about Sam being the chosen one and Dean, the brother who tries desperately to protect his little brother from his own destiny, the completely lost that by season 6. Sam's powers was the entire show - as they always said - it was always meant to be about Sam. He was the one that was chosen. Making Dean Michaels vessel and all that, was sheer nonsense.