It's the same with my merc and my sorc. Stunlocks without diminishing returns make the unstun button completely worthless, especially considering that sin/shadow have multiple stuns and large burst dmg. I don't even get to play a turret; usually I end up playing a target dummy.

I just do GSF for the quests that come for enduring it. GSF matchmaking is pretty bad. I have screenshots of all new players with only two ships vs an entire team (or nearly so) with 4-5 ships. The best thing would be a "kiddie pool" for people who only have 2-3 ships in GSF before being thrown to the wolves.