Ben 10 is not good

IIRC "GenOne" Ben 10 was rather good for it's era

and despite being 15 years old holds up on par with the original 'classic' 22- Minute Toy Commercials I grew up with

but agreed the law of diminishing returns is in play with the follow ups, (much like some attempts to milk the nostalgia from the 'classics') in some more than others