It's a game where you kill the same dozen of creatures hundreds of times in the same few enviroments to farm some items you'll later use to improve your equipment so you can fight harder battles and repeat the cycle again. The game is focused on co-op play. Bosses have mechanics and patterns you should learn to avoid damage.
I could be talking about WoW raiding though. For me, hunting games are like offline MMORPGs with lower budget and focus on what really makes them great (boss fights).
So Monster Hunter and company are like MMO's little brothers XD
They don't have a story.