When I say better writing I mean the show actually depicted its lore in an interesting way. When you learnt new things about the Omnitrix and its aliens or the Plumbers they were actually interesting. Then you look at Alien Force and it recons all the interesting details about the way the universe works into a dumbed down version.>>86409686
In the movie Azmuth was this selfish character who didn't really care about the universe being destroyed because he felt it was deserved after his creation was misused. When he did come around and allowed Ben to keep the Omnitrix he still had the same selfish attitude and his reaction to Ben's lack of interest in figuring out the Omnitrix was "I like that boy".
In Alien Force he turned into this no nonsense, super serious, strict character who would scold Ben for just about everything he did. He was nothing like the character he was introduced as and even got a new voice actor to match his different personality. And the way he was written it was like he was ALWAYS this way.
I never saw any episodes of Omniverse with him in so I don't know if they fixed this.