I'm not a backer but I am definitely buying it on Steam soon.
I really want this game to sell more than 2 million copies. But I worry that even if it delivers, it will suffer from middling Metacritic scores based purely on the fact that it's catering to a niche audience that happens to like old school RPGs and the graphics are not bleeding-edge. Wasteland 2 averaged only 82 despite being very good even taking into account its bugs. Divinity Original Sin, which was flawless IMO, only averaged 87. Even taking into account its suspicious score aggregation methodology, Metacritic has a generally bias against PC indie games.
I don't put much stock in review scores, but they do affect sales unfortunately. I'm hoping PoE averages at least a respectable 86.