MCH in its current state is neither broken nor unplayable. Its simplyfied, yes. But it still got its flow and far away from being overly punishing.

Remember, when EVERYTHING was punishing you when playing MCH in HW or SB? Even your burst punished you with low dps afterwards.

If Yoshi-P would come to me and ask me to fix or change MCH, I wouldnt have any ideas. The only two things I can think of is to add a AoE combo (instead of having that stupid flamethrower and spreadshot) and a unique utility to it.