I get it...... its just hard for me to pull that as something to KNOCK this movie and other Marvel movies on when there have been and clearly are many great movies past and present where villains have been treated the same way or less. Then again, I guess cuz its a comic book movie then maybe the extra criticism is needed and mandatory.
Classic films like Rambo NEVER had a great villain but didnt take away from them being great iconic movies, same with Indiana Jones, same with even recent shyts like Fast series. Hell the villain in MOS and BB were about in line with was Mads did but not even that to me hurt the films since again I think the bigger story is the films titled hero and his journey and the characters supporting them that will be mainstays in their journeys. (attention to anyone that may come in and specifically speak on the choices I picked..... those were just random movies I thought of at the time of typing this.... please dont respond with the BS "bu bu bu bu but he just compared this movie to ______ specifically")
The Loki's and Magnetos are different from the standpoint that they play integral parts in the hero's journeys in the long run. The Jokers and Doc Octs are different because prior to the movies they are iconic characters that have great followings and much longer, deeper, and popular histories and bigger crossovers and fanbases.
I still think on a basic level we DID get material to understand why Mads was doing what he was doing (explained in the scene with A1, Strange, and Mondor), his side of the argument (explained STRAIGHT FROM HIM in the NY Sanctum when he was temporary restrained). But I do get what you're saying and not trying to really argue against or fight your stance on that.
I was just good with that, seeing him with 2-6 more monologues or a flashback of him as a child/student of the A1 or etc wouldnt have done too much more for me. Seeing him in more scene kill people for the sake or killing them or causing more damage and violence also wouldnt have done much more to make me think "oh he's the real deal" than I was already convinced he was.
I think for someone that is "one and done" he perfectly served his purpose and I'm ready to see how Modor and Dumaramu (characters again I really dont know much about but intrigued) do going forward