Heh, what are you looking for?
"Hmm, these particle systems seem to be pretty good! I like how the point sprite always faces the camera...as it should!"
Most of the game engines in use these days take care of the technical how-to's so I don't think you'd get a lot of variety in the technical reviews. If you want the deep dive on the technical aspects of a game, you're not going to get it by looking at the game play interface a player would see.
As far as the game design goes, that's a lot harder to review because its not really something tangible and readily evident.
"Oh, I think they're using a variable reinforcement reward system here using equation XYZ with the constant values ABC."
The reason you usually don't see these types of technical reviews is because the audience (game developers) is very small and there isn't really a reason a fellow game developer would need to "review" another developers game. What do either parties get out of it? Nothing. The game has already been shipped and the technical how-to is generally something we can figure out for ourselves if it's not already solved with our tools. If there were bugs / problems, it should have been caught in pre-release QA, not a post-release review.
As far as we're concerned, it's "Hey, congratulations! you shipped a game and it sold really well! Looks like you still have jobs!". That's the only review we really need and we don't need other developers to tell us if we did that well -- the sales figures will tell us that.