Cannot tell you how many games I have lost because CM was on my team. Yes, she can help you win your lane, but if the game lasts longer than 25 minutes it becomes 4v5. Hell, just the other day I was PL and had radiance at 19 minutes, ended up something like 20-4 and lost the game. Why do you think I lost? Well, in a team fight, CM would basically use nova and run to fountain or die - 4v5 from the start. Against the enemy team supports (invoker, pugna) she simply could not compare. They were able to farm sheep sticks and euls and BKBs while all CM had was a force staff and 800 health at level 16.
If you want lane control pick Lich instead. He automatically drags the creep wave to his tower and has the exact same slow utility CM has, combined with a much greater nuke capability and 315 movespeed instead of 280 so he doesn't die the second someone breathes on him. Frost armor is also far more useful against carries than frostbite ever will be.
I could not possibly hate a hero more. Please stop picking CM when you are on my team and losing the game for me, I really do not appreciate it.