This almost seems like a discussion that could go in circles (haw, a pun) (Circles... White Album... George Song. If you don't get it, research it.) forever.
As some comment that the lesser songs are what make the album what it is. The White album was the first true album I bought. I wasn't crazy about it, and I had it on cassette so it wasn't easy to skip songs. I personally love the White Album for the Helter Skelter that it is...(another pun).
The up and down that the album takes you on is exactly what makes it so good, and it took the Beatles a little more than five years to have the license to be able to put something like that out, on two discs no less. If anyone else had of done it, it would be garbage. I think that it kind of tells a story of, hey, we spent some hard years touring, put out some ground breaking psychedelia, and now we are going to indulge ourselves in a album that is all over the place and strangely has a thread running through it.
Some make the argument that it is four solo albums in one. I think the in-cohesiveness is exactly what makes it work, in a backwards way.