The final form of a cool monster is basically a sexy dude in armor.
Whenever the show want to show how evil the villain is, they will make them do crazy face, giggling, tongue sticking out, fisheye lens, eyes narrowed, and over the top insanity talk.
Whenever there's an story that's slightly dark, the first thing included in the first chapter/episode is rape to show how "dark it is".
"I will have to use THAT" on a cliffhanger episode.
"If I use this, I'll die", they never do.
Character uses a move but it failed against that particular enemy: that move is never seen again.
"If you use this power, you will never be a fighter again..." they get better after a chapter or two.
Characters bullying a "loner" character that is clearly capable of toppling mountains and/or knew of their past.
The main character's entire movesets is just an small variations of the same move.
Entire plot comes to a screeching halt because it needed to spent time on ecchi moments.
Cool premise gets drowned out by boobs (Food Wars).
Children that only got 10 days of training is stronger than a dude with decades of training.
Nearly all romance revolving gay characters is fetishized (Yuri on Ice is a notable example of recent memory)
Main Character is the weakest in the anime, everyone disrespect him, treats him like bottom tier, but his power is able to alter reality by will, so...?
Someone makes a parody of existing shows. It's automatically "edgy" and "deconstruction".
The show introduce an fairly powerful villain anything this show has ever come across, and would takes several episode. Gets taken out in the same episode it's introduced and done in the most uninspired way. Oh and that "villain" is never seen again.