The system can't grantee the outcome of a game even with what is supposed to be a very balanced match. What pool you are in is determined by the region you selected for example, US East, Europe West, etc Originally answered: Tags for this Thread matchmaking. There is only one known complaint about valve's matchmaking with strong evidence.
However, in Ranked matches, the only difference of MMR is that it is visible on your profile.
Dota 2 Ranking System (MMR, Ranks, & Leagues)
Ranked Matchmaking allows players to earn seasonal ranking medals based on their MMR. Updated on 24 January Dota 2 is always fun when you play with your friends or gaming partners. An extract from official Dota 2 Blog. If the regions were completely separate region-lockedwe would end up with a distribution that looks like this note that this is highly exaggerated: How dota 2's rework on your mmr is a 1 oct 1: This is a problem with the easiest way to understand things in that reach level 13 in.