For those that talk about Dual Cast Impact stunlocking, they obviously haven't seen Windshear. Take a look at this http://www.youtube.com/watch?v=qPBzei-C3r8
The thing is, though, that this is nearly a perfect example of destruction right now. You can stunlock enemies to death with no chance of them attacking back, but do piss poor damage in the process. This makes for a spammy, repetitive, and not fun playstyle. What a lot of people want is to remove or weaken the Impact perk and increase damage to compensate, which not only is a lot more fun but also a lot less cheap and gimmicky.