It's the one thing that sucks about playing Blasters. You do have some controls in DP, and unlike other ATs you can use your T1 and T2 powers while mezzed, but that's always going to be a Blaster's kryptonite. You can get KB protection from IOs, and there are a number of powers in the game that will give you some mez protection, but it's all pretty limited. You can get some via Incarnates, but of course you have to get to level 50 first.