Regarding the arguement of Defense vs. Resistance, all of the tests that indicate they are balanced are assuming one thing - hit points on par with a mid-level player. The henchmen have much less hit points than the players, so that one solid hit can kill a henchman where it would only wound a player. As a result, Resistance is definitely better. It prevents the one-shot kills. The lower the Hit Points the more important Resistance becomes. With 1000 Hit Points, sure they both average out. They take a 200 point damage and it will average. But if you have only 200 hit points, then they do NOT average out to be equal.
I find from my teams that my MM can fight better than Dominators, equal with Stalkers and Corruptors, and not as good as a well-played Brute. Brutes are the combat kings as far as I can tell, but I like my MM - it is very fun to play.
Now if they would only fix the cape mission...