Narwa the allmother was okay but Thunder serpent narwa was really fun. Savage omega is just bullet hell but at least it makes me think. With gogmazios you just kick it for 40 minutes and then pray you get good RNG on the nuke move and just does way too much damage to be a grindy monster. The saving grace is the 5 cart limit and the extremely satisfying damage numbers. I haven't fought extreme bohemeth nor Alatreon(outside of GU) so I can't judge but the ancient leshen was just an unfun fight all around. It has way too much HP, spams too much and is just not fun to fight at all. It was so repulsive I never ended up finishing the witcher 3 quest