Monster Hunter Generation Ultimate is a port from the 3DS game, the Generation gameplay is slightly different to World. World plays like the old school way, while Generation has the new Hunting art which is a fresh idea implemented.
Just need to find which art/style you like most and play to its strength and you'll find it a lot of fun. The aerial style is a lot of fun, the guild style should be the most basic one which should be similar to how World is played.
There are couple of videos on Youtube that showcase the different styles for each weapon.