Name them.
Small and hard to read NPC text boxes, big amounts of invisible walls, the loading screen animation sometimes stops working, really lame jokes (e.g. kids in the Moga village being called "Future alpha male" and the chief's son talking about BBQ all the time), Inability to travel to the other resource lands without having to start one of those stupid "Gather resources" quests, loads of animations overlapping, graphically dreadful port from PSP to Wii U, very hard to follow for new players ( I had to watch Dmjared's guide videos to get into the game), Very slow combat which would be loads better if it was more LoZ like for both the players and the monsters, The stupid traveling system between areas, Minimap being a giant pixelforget, quests not describing what area the monster you're hunting for resides in, quests not telling you what the monster looks like (I had to use some sort of a wiki all the time when i start a quest, Even the quest info tells you nothing), a really hard to follow story (I have no problem with big loads of dialog, but when the dialog is so loving small on my 40 inch TV that i have to use a spyglass to see it, I just don't read it), the improved player models and monsters but no improvement in environment which is a giant turn off and the "guild sweetheart" in Moga village moaning like she's getting forgeted whenever you talk to her.
There are more, but i have forgotten most of them.