I'm always amused at those who viewed Lennon as the "heavyweight" of the Beatles, and McCartney as the pop lightweight, when it was Paul who gave us "Birthday", "I'm Down", "Back In The U.S.S.R.", "Helter Skelter." Lennon was over-influenced by his wife in latter years, and not to good effect either (Yoko allowed to sing on "Bungalow Bill"???)
But about this album- I personally learned more about blues country, & old rock n' roll as a young aspiring guitarist than anything from solo Lennon. Just the funky, chunk riffs on "Three Legs" -dumber than hell tho the lyrics may be- showed me down-home music & rockin' tunes weren't necessarily opposites (compared to my peers in those days, who acted like Led Zeppelin or Alice Cooper invented Rock n' Roll!) The oddly gritty yet searing guitar work accompanied by the wild whoops on "Too Many People" was Paul coming alive, & breaking out of the restrained production that was a hallmark of Beatles albums. The weird rockabilly of "Smile Away" was like Elvis gone punk. "Heart of The Country" could have been one of the whimsier tunes on the White Album and would've flowed nicely. "Monkberry Moon Delight" was the most guttural vocal on ANY Beatles effort, together or solo. "Uncle Albert Admiral Halsey" was sheer Beatlesque dumb fun in the vein of "Yellow Submarine" & "Octopuses Garden".
I could go on & on, but I'll end this by recommending the imported version, with "Another Day/Oh Woman Oh Why" as bonus tracks. It's a blast and it kicks the crapola out of anything on "Imagine" or "Living in the Material World" "Get back" to the innocent days of sheer creative, wild, innocuous fun.