>and the songs were not that great,
I should clarify this.
There are some good songs on the album (Let it be, Long and winding Road, Get Back, Across the Universe etc), though perhaps not as many good songs as other Beatles albums.
But most pop albums consist of numerous overdubs and so on that give them a broader sound, but these tracks, because they were recorded by the band jamming, sound rather raw and under-recorded.
If they had been recorded in the "normal" Beatles style they may have sounded better.
The other problem is that the band members were all keeping their better songs for their upcoming solo albums after the band split.