I have to say that I don't know how any game can even be rated if it is unstable during the review game. Sure, talking about its problems is one thing, but to then give it a relative rating against other games is nothing short of disenguous (dodgy)....
Surely, if a game fails to perform on the basis of programming issues, then to give it a highish rating must mean that game stability and playability aren't considered in the rating system, and that is likely to provide a misleading perception of the game, causing people to potentially buy an underperforming product?
I am yet to see a review of a new model car that says "Well, I rated it 8/10 even though the wheels fell off on the first corner, and the pistons seized when we turned the engine off. But, it has a really good paint job, the seats are comfortable, and it's a joy to drive...if it actually starts. But none of that matters, because I got given an envelope of money at the free lunch for the reviewers".
Perhaps if a few critics actually considered the stability of games, and actually were more pragmatic in their reviews, the industry might clean up its act and start giving us games that are up to the standard that their costs actually reflect.