I've read a couple of his things and always found them a bit meh, maybe because I know a lot of the classic novels that he lifts from. Lots of ideas but the execution just doesn't do it for me.
I think he's gained a lot of traction by the image he's cultivated. People want to believe he's such a nice guy, not just because they like his books but maybe more because of how he comes across in interviews. Such a thoughtful sounding man must really be thoughtful... like how people identify actors' personalities with the kind of roles they play.
My main issue with him is that he's a Scientologist. And by that I mean that he literally grew up in a cult. His dad was part of their top leadership and his sisters are still members. Neil lets it be known that he's no longer a member, and he can't help his upbringing, but he's at least a fellow traveller who supports their causes. Anyone with his background is bound to have some fucked up values.
So yeah, huge scepticism when he strikes a moral pose.