Yep, but each recorded some pretty good albums nevertheless. The best solo Beatle effort, imo, was George Harrison's All Things Must Pass (1970), recorded immediately after the Beatles' breakup. George had tons of great songs saved up due to Lennon/McCartney's "one Harrison song per album" restriction on Beatles' records.
The first album I ever bought was McCartney's "Ram" with "Uncle Albert." It is still one of my all-time faves, and by far his best solo effort.