There’s really not, but the cut-scenes lessen by quite a lot later. When you start first playing, it feels like cut-scene city, and then you’re like dear god, it happens all the time… but later you spend more time “farming” or as some call it “grinding” and there aren’t any cutscenes then. I find the grinding to be fun, but yeah the cut-scene coop problem is my number one grip with the game because of the way it destroys the coop experience. Number two is the way they do the dang sessions in the first place.
I haven’t used the Gunlance myself so no advice there, but I doubt you actually suck if you’ve made it to Diablos mostly on your own you’ve got to have some skillset there. For the low rank stuff, I’d say Diablos is kind high up there in the ability to take people out. I mean it can happen with any monster but there are certain ones that challenge, and in my PS4 run through, Diablos took out several, me included, at least once.
Now I am no expert, and I am sure the ones claiming MHW is too easy would just, well they want what they want, but there are several that I rarely see anyone fall and Diablos is not one of them, low rank.