The Monster Hunter games traditionally have a high degree of player skill involved, not necessarily in terms of quick reflexes (though they help) but in terms of learning the moves and best ways to fight your enemies, how to best use your gear, etc. But there can be a lot of grinding too, depending on how you play.
If the end boss for a chapter is a giant lightning lizard, you could beat it through practice and slowly learning his moves and what his tells are when he's about to do a lightning blast, and what types of things disrupt his attacks . Or you could beat him through grinding lesser bosses with lightning resistant hides and crafting a full suit of armor to beat that boss. Usually I end up doing some combination of the two. I found the reward, access to a new area, to be fairly worth it. Each area is pretty beautiful and epic, and the bosses you fight are generally epic enough that it can be somewhat rewarding just to finally take one down. Sometimes you might unlock new game mechanics too.
My big issue with the monster hunter series is that each one copies most of the exact same monsters, items, and equipment as the previous ones. They will always be some new ones, but it can still feel pretty repetitive to start out fighting the exact same dinosaur monsters that you started out fighting in the previous 5 games. I haven't looked at this new one that closely, but I know there is reference to some kind of new continent, so if that means completely new monsters with no repeats, that would be a big draw for me.