The problem isn't so much Trueskill, but the fact that nobody good plays this game anymore. You'll find that half of the 1v1 population stopped playing when the Prophet was nerfed, so it's much harder to rank up- because a lot of the people left behind are low Trueskill.

Also, Rank (not Trueskill) doesn't mean anything. I've played Colonels that tried to tech to Vultures against a Gauss spam.