I really don't know why so many people dislike Castle. He's always seemed fine to me - apart from the occasion (I think it was a chat show) where his hand was clearly seen moving across the sofa in the direction of the bum of the young lady sitting beside him, and she kept shifting away from him. A bit off doing that in front of the cameras. Clearly he suffers from Desert Disease - wandering palms.
(and no, that it isn't original!)