I think it makes a dent. Look at the Brink forums on Giantbomb then look at them after the quicklook opens up. I don't think it's an immediate dealbreaker, but I do think it has an effect. I'm not saying that Jeff can't express his opinion. I'm just saying that it's not the best representation of the game. I think it's great that he's giving the online a chance before the review, but I wish more people wouldn't just take GB's word as gospel on these things. I mean, if it wasn't for the fact that Demon's Souls had positive buzz EVERYWHERE else then I could've seen the entire GB community (which is becoming bigger by the day) ignoring that game.
I'm not one for rewarding broken games, but I do think that it's a pretty decent game by the end of the day. Most Jeff and Brad quicklooks are them just tearing apart everything in a negative manner unless it plays similar to something they like. Watch the Motorstorm apocalypse, it's pretty much Jeff bashing the game constantly and Ryan trying to look at the upside.