I'm rather certain, some people are underestimating Ulic quite a bit.
True. He didn't demonstrate the Force grandeur of Exar Kun, but some of his actions are quite noteable, even in that regard. While during his training, he already demonstrated some nice proficiency with the force and his lightsaber, we might move to the first "real" conflict he is involved in: the Beast Wars of Onderon.
While the outcome of that conflict in particular didn't do much to credit Qel-Droma's skill, one particular scene does: The escape from Onderon's palace, after Queen Amanoa did unveil her dark side abilities. Ulic is, at least partitially, able to withstand the Sith sorcery unleashed by the ruler of the planet. Enough to carry his wounded brother Cay of to safety, through blaster fire barrages from the dark side adept guards of the palace. Not an exceptionally "uber" demonstration of force connection, yet, demonstrating some talent on his part.
Even more "force tanking" of him is seen in the Freedon Nadd uprising. When the Jedi set out to confront the Sith Sorcerer King Ommin, who has managed to overwhelm Master Arca with his force abilities, the Sith Sorcerer unleashs a wave of dark side energy against the strike team. The entire team, consisting of half a dozen Jedi - including a noteable force adept like Nomi Sunrider - was floored by Ommins attack. With the exception of Ulic, who jumped right through it and destroyed the Sorcerer's exo-skeleton, effectively defeating him.
His next force feat is one that, possibly, served as prototype for the RotS scene in which Vader, now in his suit, tears apart that room in a fit of dark side emotion. Ulic does quite the same, when being poisoned and chained to some torture device by Satal Keto. He tears himself free from a rather stable looking connection to ground and ceiling. After that, he purges the Sith poison from his blood, basically on instinct, kills Satal and floors a Jedi trio coming to rescue him (with Nomi Sunrider among them) with some massive force wave.
We can also note, that it took Master Vodo and several other Jedi to use the sever force ability against Ulic, and that just with a temporary effect. The later use of that ability against him by Nomi Sunrider, apparently just worked, because he was destracted by the anguish he felt after having cut down his own brother Cay. And even then, his lightsaber skill alone was sufficient to fend of an enraged Jedi (Sylvar).
That aside, we shouldn't face his probable least prominent appearance in "The Clone Wars" video game. He teaches Anakin Skywalker how to resist the effects of the Dark Reaper superweapon, demonstrating some familiarity with the Sith Magic empowering the weapon and defensive force techniques capable of defeating such power. And apparently he had enough arcane knowledge to built his own holocron, that was later used by Darth Malgus (as mentioned in "Book of Sith"😉.
So we can conclude that Ulic enjoys a rather powerful force connection and seemingly is equiped with a quite nice force defense / resistance. Enough to duke it out with Malgus or Revan? I don't know. But neither do I see on of the both standing before Kun. So maybe Ulic would go down here, while Kun kills the first of the opposing team to destroy the second, after the latter has killed Ulic. Just an idea, though.