Cliches aren't themselves bad. A series can use cliches and be just fine, because not every aspect of a work has to be unique in order for it to suceed - in fact, almost nothing is 100% unique. For example, The Matrix was hardly the first film to posit that the world isn't real and that machines could overthrow humanity, but it did invent bullet-time and developed new fight choreography that hadn't been seen before.
My Hero Academia has a world full of superpowers and a school to teach them how to use them. X-men, Harry Potter, and hell, even Naruto have a similar set-up. What makes My Hero unique is the close look it takes at what being a hero entails. Is Deku the greatest hero because he faces his fear? Is Bakugo the greatest hero because of his relentless drive? Is Endeavor the greatest hero because he saves the greatest number of people? Even though he abuses his family? Does the villain Stain have a point about society, even if his methods are abhorrent? Who IS the best girl, and why is it Froppy?
Hell, just on the yuri side of things, Bloom Into You has a protagonist who approaches relationships in a very mature and hestitant way, unlike the typical 'heavy blush, stammer, instant confession' types we see in most romance. It deals with issues not just on love, but on our perception of love, and how love impacts our expectations and relationships, the media's flawed descriptions of how love ought to feel, and the list goes on. The problems they face are ones we all face, questions with no easy answers.
This is the problem: nothing about We Can't Draw Love has done anything we haven't seen. The questions it asks are incredibly easy to answer, and any reasonable person would have solved them the instant they appeared. And now it turns out Miyu was Kano's childhood friend all along, that she forgot about, because what'll set this manga apart from the rest is forgotten childhood promises. This manga has no interest in setting up something new. It has nothing to say. If it was a one-shot, we wouldn't have such high expectations, but when you're been reading a story for 20 chapters, only to realize that the central premise was the only thing this manga was going to have going for it, you get a little crazy.