Being a person who follows the piracy world daily, I don't see a problem with posting reviews. I don't, and never will condone piracy but just wanted to posts some thoughts.
Pirated games usually come out at MAX a week early (the earliest game I've seen is Halo 3, about a week early. Rock band 2 was just released early, about 6 days before release).
Pirated games are straight rips of the legit copy/game (a full 1:1 copy via a special dvd pc drive). Its not like movies in which there are a ton of options (CAM, telesync, telecine, dvdrip, screeners,etc.).
As for reviews, they should be allowed. Why? Well, they are basically just like IGN, Gamespot, etc. Except for they are from people who play the games for fun, and it isn't their jobs. I don't see the difference between reviews on IGN/Gamespot/etc vs. a review by a CAG member that *maybe* has it pirated.
Do you know for a fact that they have it pirated? Simply put, no. It's a logical guess that they have it pirated, but not sure, as I know gamestops among other stores receive their games in early (as early as a week before release). The reason I know this, is not only have I worked in retail but also, without the stores getting copies in early, then pirates would have nothing to copy. Some store must of gotten rock band 2 in a couple of days ago or else it would not be released online.
They are just reviews, not much more. It's not like we are telling them HOW-TO pirate the games. Granted, pirates look to get games for free, but a good deal of pirates use it to test the game out, before they buy it, and see if its worth it.
Those are just my thoughts/opinions.