theyre ok but not great.

I find it pretty easy to slip 2 Trickshot generics in with ion turrets with some kind of proper threat. They just lock turret sideways and float around rocks flanking everyone, causing ion tokens.
Definitely not best option, but better than say...Decimators by a long shot

Lt. Kestal + Fifth Brother + Ion Cannon Turret comes in at 54pts, which isn't too expensive, but I'm not sure the points couldn't be spent elsewhere for a more hard hitting piece instead of Ion Control piece.

Fifth Brother is just there for the Force token for off/def mods, so you can use your Focus on her pilot ability.

The problem of the agressor is that within the current rules, it really cant fill its role.

There's seriously no good reason to take missiles and a turret, and otherwise its just really bland.

It needs a configuration, something like: Arsenal fighter - 3 points - reduce the cost of all equipped secondary weapons by 3 points each, up to a minimum of 1.