Also, only use your casting specials when you have the space and time to use them. If you rely on them too much, you will just get stunned, interrupted, etc. repeatedly. No need to stack tracer missle or grav round. Get what you can off on someone, but use your instant casts more. Spam your regular shot while moving, it actually does more damage than you think. And don't waste specials on people with bubbles on them.
Just my thoughts. I am sure many know better than I, but I think with those basic approaches you can do better with your class. There is always a way to do better at your class no matter what it is. Or you could just play FOTM classes like a lot of the haters on here.