The fact that, as many pointed out, there are times when the enemy becomes immune to all damage, breaking your combo not because of your lack of skill, but because the game says so, making achieving that 150-hit mark frustrating;
Some sidequests ending abruptly, like that Beastmaster in Pendrago, or the Werewolf in Lastonbell. I went "oh, is th- is that it? It's over? Not an explanation, a conclusion, or a reward, nothing?";
Alisha's departure, event that no one seemed to care about (not even Sorey who went to war because of her), and giving her clothes to Rose, like the devs wanted to piss us off. Also, her equipment was still being sold in shops, making me feel like she'd come back;
And now I saw here that Dezel will die? They would kill a party character ~70% of the game in to replace him with some guy that was introduced and last shown ~15 hours before? Why was that necessary?