First time fighting Rathalos in mh world was a legitimate 4 hour wall of getting my ass kicked in expedition mode, chasing it, getting my ass kicked again because aerial monsters are a bitch to fight with short range melee weapons, breaking its tail but getting fucked up the ass by the fact its talons are poison, ass kicked again, I get some nice combos in and then boom the Rathalos flees the area. I shuffle between maps until it's back in the map I want to fight it on, rinse and repeat the above until I stopped since I was fighting sloppy and having a cringe gamer rage moment, took a nap, then woke up and killed one first try. I slaughtered it in front of its mate since it retreated to its nest, then immediately afterwards I killed the Rathian (so much easier) too. Feels good
I know 4 hours isn't much for devolving into Game Reviewer tier shit skill level, especially with a game that does have a skill and learning curve, but I was ready to get mad at the controller or punch a wall so I think it was a very potent 4 hours.