No ship is weak if you fly it well. Ask ParaGoomba Slayer about Imperial Boba Fett, or ask Biophysical about Defenders. It can work if you learn the ins and outs of the ship.
...
Except the Scyk. Even then, it may finally find a home when the Tractor Beam is released.
The fact that 'it can work' in no way implies that other stuff wouldn't work better with a similar amount of effort put into mastering them.
If you fly a weak ship well, you can get good results against people that don't fly better ships as well as you do. However, you will likely lose against people who fly better ships as well as you fly your weak ships.