Most shows "jump the shark" after 6-7 seasons once things start getting stale. This show jumps the shark multiple times in the first season and every season after that.

The show lets go of realism in favor of sensationalism. It goes way over the top to the point of appearing cartoony. In fact I've seen cartoons that have more realistic plots than this show. You basically have this main character who is some sort of super hero with super powers and his enemies are like cartoonish bad guys with funny accents & super powers of their own as well, and the show throws so many unrealistic twists at you just for the sake of throwing twists not because they serve the storyline in any way, shape or form. Then it keeps recycling the same old clichés over and over. You find yourself thinking "what am I watching? What's even going on?" as you get lost in the storyline which makes literally zero sense. This is like drama version of American Dad.

The entire story goes from one extreme to another, jumps one shark after another and it looks more like a cartoon than a legit TV drama.

Also there are so many plot holes it's crazy. In the first episode they blow up a plane killing 250 people in LA and the whole thing gets forgotten or dropped from the plot as if it never happened starting the next episode.