I will agree that execution was a big issue with this fight. One of the major issues, which might just be a product of the times is this fight is VERY hard if you don't use third party information. If you go by only the information the game gives you, even using hunter journal to full effect this fight will take you ages. They just tell you elemental damage. You won't unlock his weakness information until a couple fights in. The way they phrase it makes it sounds like his horns are his primary target. If you don't know how damage calculations work for elemental vs raw you won't even know what you're doing wrong when you're using a weak ice hammer and not doing enough. Not sure what else they could do besides flat out tell you after a fail or two "Use a strong amount of his weak element to stop his big attack, and break his horns to stop shifting elemental types."
Overall I do like the fight, and I think once you know HOW to do it it's not that hard. But I also understand not everyone lurks on the reddit or watches youtube videos to figure out the exact science on how to fight him. He was something MHW has never really had in it's two years which is both a good thing and can be a bad thing. Elemental has always had a weird support system in this game.