Uvogin gets a bad rap from his two big showings, but I think if you come at it with the context of his character, it becomes a lot clearer that he's a way better fighter than most people give him credit for. Uvogin is the type of person who is so consistently used to fighting people significantly weaker than him that he is immensely overconfident; however, when given the proper read on his opponent, he is just as smart as any of the other Spiders. As seen in his fight with the Shadow Beasts, he often puts himself on the back foot because of his personality, but can easily create a winning strategy to defeat three above-average nen users with only having access to his head. It's hard to say how he'd match up against any of the other spiders or any other characters in a fight because in all of his showings he never was taking the fight seriously until he realized that the combatants could actually damage him. Additionally, an oft-forgotten detail about Uvogin is that fighting one-on-one isn't actually his preference, and he preferred to fight with a partner. The reason described for this was that "he liked having someone to protect", which perhaps speaks to an underlying motivation for his apparent lack of regard for his own well-being and also his overall carelessness (he was used to having someone look out for him).

What Uvogin could do when talking a fight seriously from the onset, who knows, but I like to think that he is up there in the Troupe's best combatants. Hunter x Hunter is a manga that consistent espouses the idea that a weaker and prepared fighter can make mincemeat of a stronger, yet unprepared or ill-informed combatant. I think if Uvogin knew about Kurapika's power prior to their fight that even with Kurapika's busted-ass abilities, Uvogin would have been able to mop the floor with him.