One of the cruellest things you can endure in the business of reviewing games is the hands-on preview session. You get a few hours to play a game, tooling around different encounters to see the various aspects of the game, and then it's over. It's like getting someone addicted to crack and then telling they can't have any more.
But worse. Much, much worse. Especially when the game in question is Mass Effect 2, possibly the most anticipated RPG ever, and even more especially when Mass Effect 2 is looking so... damn... good.