Yes, Kineticist is the worst class in the game for sure.
Merc have cleave, which work really well stun baton, savicite light maul, and lava hammer. Allow you to keep stunning even multiple enemies, savicite light maul with cleave allow you to spread lust damage to every lust effected enemies every turns while potentially stunning them. And sturm and drang works really well with heavy lust ray, stunning enemies while shooting lust damage which can crits. It's very easy to win this game, even late game with these builts.
Smuggler, I would argue, the best class in the game. It has stealth field generator to allow you keep dodging, can keep dodging with jumper jumpsuit, but the thing that makes smuggler the best in the game is sneak attack and aimed shot. Again, it's work really well with stun baton, savicite light maul, and lava hammer. If you want to play as ranged smuggler with this strat, you will have to use shock bow, which is pretty weak, but aimed shot makes it works even in late game. You can just keep spamming stealth field generator/flash grenade and basic attack and win at late game. And twist the knife makes it even easier and they give it assassination now. I find playing as smuggler is the easiest. I don't have to think or keep trying. Even the newest boss in the train was so easy with smuggler, a complete joke.
Next is the tech specialist, I feel like at early and mid game, it's more about defensive job, but late game, it got overclock, which work very well with stun baton, savicite light maul, and lava hammer. Basically attack thrice with high stun potential, with a very thicc shield, I like using the thicc shield with salamender defense system, which cause very high damage if your shield point gone to zero. The deployable turret is also very good, it's the only skill that allow you to summon a companion. Basically you get two very strong options at level 11. There's also the attack drone built, which allow you to use the electric tamwolf or the fire drone you get from uveto lab. Very solid job. And molten shot nukes your enemy while leaving burn status. I saw many people said it's the best job but I think smuggler is still better due to the stun baton, savicite light maul, and lava hammer/sneak attack/twist the knife/assassination combo.
And last and the least.... We have Kineticist... The worst job in the game... This class is so bad that it's the only job I have difficulty of beating Hureya with... This job is a combo job. Basically there's two builds in this game, which both are bad... First one is magic build, which rely on combo. Basically you want to freeze your opponent, use mind crush to break the ice to deal additional damage and stun them, and then use acid cloud to crits and then use gravity flux to trip your opponent and geometrical spike to crits. It takes a lot of energies and the status effects might not hit, so the combo can fail easily. The second one is magical fighter, either melee or ranged, and it's still suck because concussive augmentation and haste has turn limits, unlike second attack/second shot, which took turns and energy. And I don't get why Fenoxo make blind immunity or poison cleanse as Kineticist latest skills when the other jobs get assassination, blood frenzy, and molten shot. It was already the weakest job! I only need few turns to beat the ancient bot or the bird at phadea with other classes but it's take so long with Kineticist and if I get unlucky, I might lose because debuff miss. And don't forget grappling opponents as well. Unlike limber, mind trick need a lot of energies, more than static burst.
Unless you like playing as a magician force user or role playing as a character. I don't recommend playing as Kineticist.