Let It Be may have been an experiment that didn't work, but the result is still interesting. Even Phil Spector's 'overproduction' is okay. The songs are, for the most part, average, and that takes away from the album in a big way. Even the live-in-the-studio take of Let It Be (not the same as the single, which was a polished version) nor the rooftop performance of Get Back (again, different from the single) can really elevate this album beyond what it is: a cleaned-up jam session. This is the only album where the cracks in the armour are so evident.
But some of the songs are good: besides the two mentioned, Two Of Us is a great moment, and Across the Universe, which seems out of place here, is a dreamy Lennon track that works despite the fact that Spector essentially took the original version (found on Past Masters, Vol. II) and slowed it down, making Lennon's vocals sound somewhat croaky. I Me Mine works too, although it isn't one of Harrison's best by any means.
This album is unique in that its the most rootsy and bluesy of any Beatles' disc, but after hearing the outtakes on the Anthology, and learning from various sources the other material that the band had also been working on at the time (some of which cropped up on Abbey Road) you have to wonder how much better this could have been. Still, it is the Beatles. That alone makes it worthy for me.