This easily takes the cake as the worst monster in all of MHW. By a damn mile, it's not even close.
Not only does the constant windpressure lock you out of doing anything for most of the hunt, Kushala's tendency to fly for more than 70% of combat makes it impossible for most melee classes. His wind BS adds onto this. The fact that him taking off into the sky also wind pressures you adds onto this.
And normally you'd use flash pods for this sort of nonsense, but in MR, NO MORE! Rightfully so, flashlocking a monster was kinda dumb, but with Kushala it bloody well deserved it, and it seems to fly even more in MR.
To add insult to injury, wind resist 5 doesn't even do much against him, as one would sort of expect (the skill is called wind resist, why doesn't it help against the wind dragon?). To properly counter his wind BS, you need "wind pressure negated", which you can only get by having a HH, or by having HIS ARMOUR. WHAT SORT OF CATCH 22 IS THIS.
You can't grapple onto him half of the time due to his wind shield, and whenever he walks past you, you get stunned for what seems like 7 hours.
AND THE TORNADOES. OH THE DAMN TORNADOES. YEAH I JUST LOVE NOT BEING ABLE TO USE 3/4'S OF THE ****ING ARENA.
I don't have any respect for anyone that worked on designing, testing and implementing Kushala, and honestly, they seem like a liability to the company.