There are certain shot types that I pretty much will never take because they cannot land on target reliably, or cannot be used inside due to the wide spread patterns (they will hit other things before they hit the target). If the patterns were tighter, that might alleviate some of this. There are still some shots that I really haven't had time to play with much though.
Light spirals and bee-shot both look to be pretty good, but I don't have anything on those two types that are at the right levels for me to really use (I only tested bee-shot on Lammania with Nature's Wrath and it performed REALLY well).
Disiplinator's electrical lash works great as a shot type.
Coin shot on Breaking the Bank is great as well, but this a single target type shot (it hits reliably, and and does really good damage).
For me, Glass. I don't have the patience for Trash (projectiles are soooo... slow...) Trash if probably better though.