The 2D ones had soul, they were kinda cringe but there was a wit to the stickers that won you over. 3D ones just look like any other design by committee 3D avatars like Memojis, Samsung's avatars, horrible soulless things with no artistry, look like bad freemium game assets.
I was shocked to find them using bitmojis at all. I find them terribly off putting visually. Not a big deal of course, but until I installed Snapchat I hadn't seen one in years.
I have a feeling that My AI's weird avatar is one of the many variables as to why he was pushed back by users. It is a smug looking character with purple skin. To me, the avatar enters the uncanny valley.