Are Ultimates and Rush Attack abit too strong ?

So I started playing Berserker Kale recently and went up against some Z rank MUI players, they were really good in terms of regular fights, always able to perception and vanish at the perfect timing, I was losing with 1 HP bar left but I managed to Insta Spark, managed to use the Rush Super on him and then ulted him and just like that, I won. Even tho, he was destroying me the whole time I clicked 2 button and sneaked in a win despite being worse than my opponents. It felt good at first but the more thing about it, its just so silly and stupid because I genuinely think how overtuned the ults and rush supers are in terms of damage

Edit: The only good defense I can see for ultimates/rush being strong is to give weaker players more of a chance to beat better players