I think the reasons you give are some of the reasons why I, and others love it, the piece is a fusion of musical styles, incorporating classical, rock, blues, folk, the repetitive nature of the opening piano intro is because Mike was influenced by the music style of Minimalism, Terry Reilly in particular, and his album A Rainbow in Curved Air, Steve Reich, Phillip Glass and others, but Oldfield took these influences and made it into something unique to him, and developed his own style which fans call Oldfield Progressive. Some people will have only heard the piano part and assume the whole album is like that, which it is not, it is an album of changing moods and instruments. The other thing is about the making of the album, which in turn is the making of Mike Oldfield, it is a legendary tale. I know this music is not for everyone, but I find it beautiful, like most of Mike's diverse musical output.