Kingdom is probably one of the most predictable manga I've ever read, but I still consider it to be one of the all time great manga and one of my favorites. Not sure what predictability has to do with quality.
As for My Hero Academia it isn't even three volumes length of material yet and it has as much of an identity as any other series did when they first started. Naruto wanted to be Hokage, Luffy wants to be Pirate King, and Deku wants to become the best superhero ever.
The only difference between the three is that Deku is a legit underdog and weakling, which makes the dynamic interesting. He inherited a power that pretty much breaks his arm everytime he uses it, so he definitely has to fight to obtain even a fraction of the power a lot of the other characters naturally have.
Plus there's a lot of mystery and holes in the series that needs to be filled, so there's plenty of wordbuilding to take place if the author wants to take it into a more fleshed out direction which I hope he does.