The idea behind doing Let it Be, doing an album with minimal overdubbing in a live setting was all well and good. Please, Please Me and With the Beatles were done in similar fashion. What was missing compared to their earlier efforts was the competitive/collaborative writing approach that would actually create decent songs. And the attention to arrangement and instrumentation that gives the Beatle work its depth. Raw and real didnt have to mean slapdash.
Mind you it still gave a few classic tracks. Let it Be, Get Back, The Long and Winding Road,Across the Universe. And a few pretty good tracks. Two of Us, I got a Feeling, I me mine. So it's only a let down for a Beatles album. Most bands would be happy with it as their masterpiece I suspect.