I think those are two separate things - "it changed my life" and "It's exceptional literature" are different, although they're not uncorrelated.
Certainly. I'm interested in why people would say either of these things. From my reading, HPMoR is interesting and well-written, but it's hard to see why it would change someone's life or why someone would think it was an utterly new mold-breaking work of literature.
You know the drill - If it's worth saying, but not worth its own post (even in Discussion), then it goes here.