I think these kind of games don't have it easy. Even if they are very good (and get a Metascore of 90) they aren't must haves for many people. There are too many who are like "I get that game used" and instead of letting people wait for a used copy, they are like "just buy it new for 20 bucks less"
I think it is a good idea to sell some games for a lower price if you know that they won't sell too well otherwise. More people will buy it day/week one and if it is any good, more people can tell their friends about it who might buy it as well then.
If only a little group would get it at release, there would be also no word of mouth to increase sales over the months after release.