[wldcordeiro]

The problem is that the reputation system is hard to do right. Players will game it or unfairly "down-vote" people to troll them.

[JonoBB]

Its not hard at all. In Dota you only get a certain number of down votes per week, so you don't waste them.

[duskwuff]

And it appears that some of those "downvotes" (called "reports" in game) are automatically cross-checked by the game. For instance, reports of "feeding" (that is, deliberately dying to give the enemy team an advantage) might be discounted or ignored if the hero being reported hasn't died repeatedly.

[onetwotree]

Also you get extra votes for reporting players who lots of people are also reporting for the same shit.