@ making: often reviewers are either doing special mp events for the test, as there is no one else online to play against (and debug kits are not able to connect to PSN for example). Therefore they are pitted against each other on specific events, so that they can test it. Because of the smaller scale, it's often easier to manage it all, and less bugs and stuff like that creep in, I think.
@ topic starter: about heavy Rain: I have the preview build, another preview build and a review build here. The preview build made me get stuck at a specific point; the second one fixed that problem and the review build never even glitched, it was a flawless game from front to back with me.
So maybe reviewers didn't mention it, because there was nothing to mention?