The problem is that most press that surrounds a game before release is typically designed to make it look good and almost never showcases the issues it will have at launch.
This, combined with the lack of wide spread playable demos for almost a decade, makes for a slanted market. Reviewers exist largely to give us a decent idea of how the game actually plays and looks in the wild.
Plus, 2 hours is not enough time to test most AAA games. Never mind that the timer starts as soon as the game does and thus doesn't represent actual time played. You can leave the game running minimized at a menu for 6 hours and that will count towards your "play time". This means that cut-scenes take up that time too. This matters if it's a story driven, cut-scene heavy, game. Then figure most games vary in handling depending on early, mid, and late game staging. You can't even get a feel for the bare mechanics of some games in 2 hours much less decide if you like it.
Anyway, it's very much a broken industry in my opinion, and press or not odds are they're trying to hide or downplay something.
Actually I can, but in the unlikely situation 2 hours ain't enough you can trick steam into thinking the game isn't running or block it from finding out.