As I had mentioned yesterday, the only things that The Beatles In Mono box set didn't contain were the albums that were only released in stereo. For whatever reason, you have to buy those separately. As far as full lengths go, that meant only having to pick up Let It Be and Abbey Road.
Maybe I'm in the minority, but neither of these two rank all that high on my list of favorite Beatles albums. The issues that plagued Let It Be during its recording are pretty well documented and I think the general consensus is that those issues bled through to the quality of the album, so my feelings are probably echoed by some. However, I definitely seem to lack company regarding my opinion of Abbey Road.
Many view it as the exclamation point of their career; that one last stab at greatness from a a band that will likely never be equaled. I think it's OK. There are a handful of songs that you could even say are pretty great, but if you set it up next to virtually ever other album in their catalog, I'll likely favor that other album (sans Let It Be).
The weirdest thing about the In Mono box set is that its singles collection, Mono Masters, doesn't contain two songs that the Stereo Past Masters release does: "The Ballad Of John and Yoko" and "Old Brown Shoe." It seems ludicrous that they left off two songs just because they are in stereo. Do they really expect you to buy the entire other Past Masters LP for these songs? Seems silly, so I just picked up the old 7" release and now my collection of Beatles songs is complete. At least until you start looking at those Anthology or Live at the BBC albums. I haven't gone down that dark road just yet...