gonna +1 Neoxx's comments - I use them on my main too.
The main reason that put me off missiles however is crosstraining - its a lot easier to switch from magnetic to lasers and visa versa than it is from missiles to any of the gunnery.
The thing that kept me was I <3 the gropho and waspish and i'm hoping that howitzers when they come will use the same secondary skills as missiles.
Waspish is imo great due to its range. Makes a good intakt killer and is also good for pve.
Gropho is good in comparison to the other heavies due to its ability to lock extremely fast making you a lot less vulnerable to ewar. Its also a LOT easier to keep energy stable while tanking. For these reasons I think if anything it still needs a bit of a nerf.