I can agree with this. Losing or gaining rating on a match that ends in a draw doesn't make sense.
Sometimes both teams even gain rating as well.
If I may, I would also like to offer a suggestion that somewhat correlates to this.
To expand a little, leaving a match early should probably not lose you points either.
More specifically, there is always one player that never offers a draw when the other players do vote.
For example, not too long ago, some buddies and I joined a TMM game, and one player, unfortunately, crashed upon start - after conversing with the opponent team, we all agreed on a draw.
The votes were in, and yet the game did not end as someone did not vote.
After waiting a while, my team and I decided to just leave as we were not getting anywhere...
and in doing so, lost rating. The game lasted about 4 minutes in-game time.
Granted, I can see some issues with this as some players could exploit it if they just leave a match immediately, but, perhaps this could be avoided if most players offer a draw... similar to how the recall feature works. If all but one player agree, the game ends in a draw.
Alternatively, it would be nice to see who voted and who did not.
~ Stryker