Beatles albums prior to... I want to say The White Album? Or it might have been Sgt. Pepper/Magical Mystery Tour, were recorded in mono and originally released in mono. "Stereo" versions were released ("Fake stereo" AKA recording in mono and panning it to one side or another) which are the ones that sound kinda bad imo. They were never intended to be listened in stereo other than as a novelty.

It wasn't until their later albums were they actually meant to be listened to in stereo. Eleanor Rigby, being on Revolver, was not recorded with "real" stereo mixing in mind as far as I understand it. If you're listening to the 2009 Stereo Remasters (the Box Set versions), then they were properly mixed into stereo, and sound pretty good. However, the original experience was always meant to be mono.

Though I'm sure there's some expert on this shit that knows more than me.