Mojopie I agree with you all the way. Plastic Ono Band is excellent. Some people call Neil Young the granddad of grunge but I think John beat him in there somewhere. Very very raw indeed and that's why I think it can be hard to listen to sometimes (Mother tends to give me chills) but it's a great album. I too find Imagine to be one of John's lesser songs, it's kind of boring to me compared to some of his other work. Love Walls & Bridges, Double Fantasy, Milk and Honey, and I'm probably the only person on the planet who sometimes enjoys some of the New York City stuff, too (though I do recognize it's a far cry from brilliant, of course).
I love the Beatles (doh) but some of John's later work is so different from his Beatles work, especially the earlier stuff, that it's almost hard to compare it. Still, some of the Beatles stuff majorly outranks the solo work imo.
Also, I realize this is a Paul message board, but why when these kinds of topics come up must there always be a comparison between John and Paul or all of the former Beatles? When the question is, 'was John's solo work any good?' can't we just stick to discussing John's music instead of diving headfirst into the old comparison game between John's and Paul's stuff again? It might be a more interesting discussion than hearing "John's Xmas song is better than Paul's", "no Paul's Xmas song is so much better" a bunch of times (no offense). Same as when we discuss Paul's music over in the Paul forums, we don't need to drag John's stuff into the discussion all the time. Just my $0.02