You've just missed the patch were psi's were the dps gods
They have been balanced now back on par with other classes dpswise and is now a bit among the others with no heads looking above the other classes. Pvp wise the support role is very good on psi as he can suppress a target with all the possible debuffs all the time, literally *_*
would it be worth it for me to keep playing my lvl 35 Gunner to reincarnate or just make a new class
Yes, continue your engineer as Medical Turret reinc skill is very good and highly desired in high end-game content (mass puri).