First, Ben 10 was good. Gwen was the worst part of it. It had fun action scenes, it was legitimately funny in places, and Grandpa Max was almost an Iroh tier uncle.
But second and much more importantly, it implies no such fucking thing. There's nothing inherently bad about Ben 10 as a concept, and you can make a good movie out of anything. If you don't like the Ben 10 cartoon, what would you change about it to make it good?