Least favourite sets are the 2016 Toa Uniters, I just dont like their look, they feel off to me. Most disapponting set is Ekimu the Mask Maker from the summer wave.
Simply put I have not gotten 2016 Ekimu nor any of the 2016 Toa sets, mainly due to their weird appearance and to me having more flaws than good things regarding them (from the stubby legs, tho the colour schemes, to the armor placements, to the weird weapon designs, to the ugly masks minus Ekimus which is fine). This is why the only set up I got was Umarak the Hunter, he needed least amount of work to edit when I bought him and his appearance is consistent and appealing to me.
The beasts to me look to have less flaws than the Toa, mainly due to the fact that they are the bad guy beast who are ment to look off. But I rarely like those concepts, which is why I passed on those and with all the 2015 villains (minus Kulta who had to came with Ekimu). Umarak the Destroyer is not something I would like to have, mainly due to his head and arm configurations (better to say the lack of posablility), his mask is ugly, and he doesnt come with any other mask, not to mention he is all black and neon yellow, which is why I would rather get Umarak the Hunter instead. He to mean is more appealing.
I would have bought some of The protectors and creatures if they werent the first things to get sold out due to the lower price and the impulse nature of buyers in my country (which buy the cheapest sets for they kids to save up money).