I'm taking the old man to see Genesis next July, and the reason a lot of Genesis fans dont like it is because of one reason:
Phil Collins.
With Gabriel singing, Genesis were mad, and as uncommericial as you could hope. One of the founders, if you ask me, of alternative music. Chekc out Suppers Ready, or the albums The Lamb Lies Down on Broadway or Selling England by the pound. Its just wierd. But in many ways, brilliant.
When Gabriel left, they just became a pop group. Doing songs like Follow You, Follow Me, I Cant Dance, Invisible Touch. So the basic belief was that they "sold out." I think they didnt have much option, if collins had been Gabriel make 2, dressing up as a sunflower and singing about birds eating worms it would have been a disaster.
And thats the reason why.