I know how much work it is need to make "work" and to make out a single episode of a tv show, but that never will be a excuse i believe for the creators to be lazy, to reject good artwork from their own designers and only take the one that follows and can adapt the lines of their own design cheap design, when they could had done something more creative and complex.
In the same way i will never be happy in how the story is make out and something will always fail that is clear and that will always happen, the mistakes and flaws will be always there.
I know every single show had a tone, because the first 3 were into the same genre: Adventure/Action and Omniverse was more about the Action/Comedy to the end of the series.
I know Ben 10 was a mix of road movie genre and sci-fi.
Alien Force was a mix of thriller, suspense, mystery, a lot of sci-fi and like to play with themes like teenagers in the run, after high school 3 teen agers fight in the middle of the night a secret out space invasion to his own town.
Ultimate Alien go right into the sci-fi and road movie genre again, but was almost every single time a new theme a mix of things.
Omniverse was more about the sci-fi, again the road movie genre and the main theme of the 60 episodes, was "Now that Ben is the hero of the earth and the savior of the universe, know his own "little" human world will mix with this huge Alien culture".
Maybe i am not from the United States, but i love to write and create, the rule #1 in every creative project is and will forever be: "Dont be lazy, be creative, if it hard to do and is not cheap then is good, rewrite a lot, rethink a lot and find it a way to work".
For me Alien Force will be forever a nice mix bag of good and bad items, because the tone is good, the general plot line of the Highbreed and Vilgax story is good, some "filler" episodes are the best one developing all an episode around two characters and their relationship, creating themes, messages and even villains from zero only to do that, but the design, the use of the Omnitrix and the way the show was made make it full of plot holes and mistakes you cant avoid to see.