The characters just look horrendous. I dont know how anyone could look at the Iron Man designs from the comics from the last 20 years, and go "yes, lets make him look like C3PO".
Iron Man's armor is supposed to be sleek and beautiful like a supercar. Its part of why the progression of the MCU armors is so well regarded, not to mention Adi Granov had huge part in establishing Iron Man's look in the comics,