Mental Entangle is too cheap. That's the problem. Champions characters often have their STR bought up at least a little, and even if they don't, there's usually creative ways to wiggle out of a physical Entangle or help someone else get out of one.
Conversely most players don't buy up their character's EGO by much if at all; it's expensive and unfun to do so and it rarely clearly supports the character concept. So a 60-point attack on a PC's normal-range stat is gonna mess them up. You have to let characters push EGO or otherwise creatively counter the special effect in order to figure a way out of a ME. Or increase the price, or require all MEs be bought with Ablative, or something.