A quick perusal of the titles and descriptions might make you realize that they probably didn't sell very well not because of the AO rating, but because they simply stunk.
2
The controls stunk, and quite honestly, the storyline-though VERY loosely based on events in real life-just went flat right away after playing through the first level.
3
Players of Goldeneye 64 might recognize the look technique and I'll be honest, I stunk at that game for some reason.