Hc Magisters terrace was completely fine with some melee. Even if no CC or just 1 CC ingroup. Most tanks just sucked. This applies to all BC heroics by the way.
I agree that some of the current CM content (even heroics) are very punishing for melee - if they want to stay out of trouble their dps uptime will be lower on bosses, which does matter when you're against the clock. However I don't think it matters much unless you're up for gold.