That seems like a really interesting development! Epic is going to use a rating system based on random sample polling.
There're some real hurdles to deal with, naturally.
First, the length of a game could make a mess. It would be fine if people that don't like a game tend to drop out around, say, 25% of the way through regardless of the length. If the game is 100 hours long, people that don't like it will check out about 25hrs in while people who don't like a 10hr game tend to drop it 2.5hrs in. However, I don't think that's going to be how it works. I'm guessing that people would take more like 5hrs for the short game on average, with quite a few people finishing the game even though they didn't like it much. Meanwhile, the people who don't like the 100 hour game are giving up after maybe 10 hours on average with very few finishing the game even though they dislike it. It's probably possible to correct for that, but I bet it won't be easy. If they don't, longer games are going to get higher ratings than short ones.
Second, those detail questions are going to be a bother. "How challenging are the bosses" makes no sense in a game like Civilization. It would be nice if they could tailer the questions for every game, but there's a LOT of games out there. For the blatant examples like Civ and bosses, they can just have an "n/a" option and call it good, but what about the harder ones? Some games have encounters that are kinda boss fights, kinda not - so some people are putting in n/a while others are putting in ratings. They seem to need another system that checks to see which of the questions are most relevant to a given game.
It could have a lot of plusses, though. Like the article says, you aren't going to see the ratings plummet because a small group of people all go out and review bomb a game. If a game does something that many people don't like, it will still pick that up, but it has a decent sized chunk of the people that play. It's fast, so they should get more participation (especially if they make it worth your time by, say, giving you a tiny discount on your next game). Also, you aren't stuck with the up/down binary system that Steam has.
It is a RATING system, of course. All you'll get out of the system is whether people are liking the game or not. The extra questions might give some insight on why, but those questions aren't going to cover everything. I wouldn't be surprised to see a game rated as 2 star even though all its specific questions are 4+ stars.