I think MMR is overrated anyhow.
I actually share my account with my noob cousin so I can keep my mmr low enough. High mmr players can be so stupid sometimes. Just because you are 1600+ doesn't mean you can go and trash talk others and they think if you don't have the same mmr as he/she does, you are noob. I mean, wtf?
Plus, when mmr gets too low, good players will just go on a mmr pumping streak... I'm currently doing like 10+ straight win. (thank god for the new BH.
) Another guy on my frd list was down to like 800, and then two days later, he's back to 1400.
Can't wait for DOTA2 though, I'm sure it's gonna be fun with Valve/icefrog behind it.