For the most part I agree with your assessment, but if I could be so bold as to add another peeve to the list.
5. Songs that have absolutely nothing to say. Songs where the lyrics have no emotional or intellectual content whatsoever.
If I disagree with anything it might be your reference to "Singers who can't really sing". This might be an interesting topic on it's own, but some of my favourite singers aren't good singers. Case in point, Neil Young.
He has no vocal range and can barely hold a tune, but it doesn't matter to me at all. The strength of his writing and the sheer emotion of his vocals make the other deficiencies irrelevant.