I've actually been using missiles quite a bit on the imperial courier for some time now.
I enjoy them for the experience - one med beam laser in the middle two fully loaded seeker launchers on the nacelles, a bubble canopy (I sit way too low and towards the back, but still...) and Top Gun here I come - just the perfect experience after swinging around my oiled beerboobs not playing beach volleyball after a hot summers day.
But let me compare them to 2 gimballed cannons:
- Skill required to aim: None for both (draw).
- Ammo Count: Cannon 100, C2 Missile Launcher 24 (Cannon).
- Grid usage: Over twice as much for Missiles (Cannon).
- Abiilty to target subsystems: Cannons only (Cannon).
- Immunity to point defense: Cannons.
- Immunity to chaff: Missiles.
- Time to lock for Missiles vs gimballed Cannons gimballing in: Cannons.
- Immunity to launched heat sinks: Cannons (not sure if that was changed though).
- Damage to shields: Appeared to be higher for Cannons, but I don't have the numbers to back it up (Cannons?).
Anyway - I still use missiles because gimballed weapons crosshair wobbling make me want to punch my HUD, but really Seekers wouldn't be OP compared to gimballed Cannons even if they had three times the ammo, ability to target Subsystems and a third of the current grid usage.