Concept and execution are separate things. And Just because something is successful, relative or not, doesn't mean it's good.
It might as well be common knowledge that the public as a whole has shit taste.
The MCU, MTU (Marvel Television Universe), and technically the MCTU (You can make the connection), and by fucking lord, anything to do with the DCCU and DCTU. MCU is pretty hit and miss, but anything MTU, MCTU, DCCU, and DCTU are straight up trash, but people fucking lap it up. The Walking Dead was a huge hit, but anything post S1 was utter trash. And this is just the mainstream /tv/ tripe, since 90% of the public doesn't watch cartoons. OH, shit. StarVs, shit. Nu-Ra, shit. Korra, double shit.
You can't trust people to not have shit taste. I mean, look at RWBY, more than half the time RWBYfags can't give you a straight answer of why they keep watching, and most of the time they readily admit it's shit. But it's still going, and profitable.