Qui Gon was having a hard time going up against Darth Maul and ultimately he was killed by Maul. The reason was that Qui Gon was old, he was over the hill, past his prime whereas Darth Maul was at his prime. That being the case, in the fight where Anakin goes up against Count Dooku the first time he loses and he loses an arm, in that same fight Obi Wan also loses. Now, Count Dooku is old, he is older than Qui Gon. As it is, Count Dooku was Qui Gon's teacher before he turned to evil, so he is significantly older than Qui Gon. If Qui Gon lost against Darth Maul because he was over the hill, than how is it that Count Dooku, who is older than Qui Gon and thus even more over the hill, able to beat both a budding Anakin and Obi Wan at his prime? It was only when Yoda came to the rescue that Anakin and Obi Wan were saved.