Hmm, this is making me think.
1) I love the Motherpeace deck. Totally falls into the cateogory of "ugly". But one of my first tarot mentors reads with it almost exclusively and energetically it just does it for me... it tells a very different story, but it's like you have to be immersed in its mythology in order to read with it. I still think it's ugly but I read with it anyway, because of the personal connection. It's not my go - to deck. I kinda have to be looking for the type of advice it's going to give.
2) Wild Unknown... I thought this would just be a pretty deck to add to my collection, but really it goes very deep, at least for me. It resonates on a spiritual level like only a couple of decks do, I can sit and just look at the cards and get more out of it than if I am verbally interpreting. My readings with it are often highly intuitive and touch those parts of myself that are uncomfortable to explore. I would agree that the meanings are more Thoth based, I usually use the Thoth interpretations of the pips (an example that I can think of off the top of my head is the Three of Wands). The art is right up my alley and I actually really love "nature" decks and am a little distracted by decks with humans in them, mostly because of the "ugliness" factor - it's easier to draw a good snake than it is to draw a good person perhaps? Also, though, I work a lot with animal guides in my own spiritual practice and I don't tend to read court cards literally anyway, so it's rare that the Queen of Wands is "a strong - willed woman" in my readings, etc. One card I can't resonate with in this deck is the High Priestess, I have to work with her every time she is drawn to pull out a meaning... a white tiger? Really?
3) Greenwood. I use this deck purely for altar work / journey work. I don't read with it. It's used to mark the Wheel of the Year on my altar and sometimes I will draw cards / arrange cards when I journey. So no, I don't resonate with it as a reading deck, but I do use it anyhow.
Oh, and I would also like someone to enlighten me on the appeal of the Deviant Moon, people love it. Why? I just can't connect, I think it's ugly and disturbing in a way that doesn't do anything for me.
Just some thoughts.