Annoying stereotypical shonen main character.
Asta from Black Clover is your stereotypical annoying schounen MC taken to 11
While I agree that Luffy does share a lot of similarities with other shounen MCs, he also has his moments and my only problem with him is that he hogs all the spotlight in terms of fights (3 fights with Kaido per arc? Seriously?). Overall I find him less annoying than, say, Natsu or Naruto.
I wonder if us not getting enough insight into his inner thoughts is a good thing or bad thing, on one hand, it's interesting to ponder what the hell is going on in his head, on another hand, maybe it's best that we don't know
Luffy reminds me of Saitama from OPM.
Ichigo reminds me of that Beelzebub MC.
I'd say Ichigo is somewhat edgier, but overall he follows a lot of MC tropes - the chosen one, the determinator, the strongest one...