Maybe 'cause they got away from their 'darker side' and that Indian Guru junk. One LP I absolutely loathed was Rubber Soul, but ironically I loved the White Album and 'While My Guitar Gently Weeps' (now I know why, I found out it was Eric Clapton playing lead guitar). And of all things I liked 'I Am The Walrus'(1)
(1) I drove the guys in the local Tavern nuts paying that over and over and over. So much that when the Jukebox guy came in they bought it from him and gave it to me as a present ;-)