Kylo had a giant bleeding blaster wound in his gut and was emotionally unstable (more so than usual) when he fought a trained soldier who got one hit in before Kylo wrecked him. Then, while having the aforementioned blaster wound and light saber cut, he fought a girl who was experienced combat from several years of surviving on her own on a dangerous planet and who is naturally attuned to the force.
Dooku's skills and stability generally make him a rather perfect counter to Kylo. But his record isn't exactly spotless. Dude got captured by regular ass mercenaries during the clone wars.