If you were to talk to us as individuals, some of us would agree that there are quality eroge out there. Others of us avoid it like the plague. For me, Crescendo is one of my favorite visual novels and I've heard good things about Yu-No. But so long as I've been on staff, the policy has been not to review AO games. M is the highest we go. Kinda like how movie theaters only have movies up to R and you have to go to special movie theaters to see X.
And for every good eroge like Crescendo, there are hundreds or really bad and/or disgustingly degenerate ones. If I were to review Crescendo, then we'd have to review something like Water Closet and from what I've read about that game, I simply cannot in good conscience review a game where, reportedly, a doctor chains a girl to a urinal and has a gang of his cronies all pee on her. In addition, considering all the stuff Peach Princess localized (not to mention other publishers), it would take forever to even go through all the eroge and we'd neglect the meat 'n potatoes titles we need to focus on. Also, we're not an age-restricted site and have no plans to add on an "adults only" section when plenty of other sites out there already scratch that itch better than we could.