The Wild Unknown is so universally loved that it's actually quite refreshing to see somebody not falling into aaaah and oooh when opening it ;-)
I personally love this deck for many reasons. I love the art, it's deceptively simple and very well done. Art done with lines and relying mostly on black and white, i.e., darkness and light, is more toned down and at first it seems less emotional than swaths of strong colours. It takes more of our attention to "read" the emotional intensity, it's more discreet, like talking in a lower voice. The graphic elements, the line work, is never self serving or purely decorative; it's expressive and always has a function. Like in the 7 Pentacles where it really leads the eye upwards, like the planets or virtues do...
The colour washes that appear take on a much stronger meaning because the artist doesn't drown us in colour. I really like that approach, usually the proportions between use of ink and use of colour washes is very different. But look at that Empress - the colour seems to live.
I also like the non-cute look at nature. I have animal decks where the animals are "cuter", more humanized or more decorative, and that's okay, too - after all, since we were children we projected our own emotions on animals and use them as mirrors. Here, the Wild Unknown is really unknown, and we have to work harder. I sense something of the awe in this deck that I feel when I see wild animals in nature - there is so much to their life that I don't understand, it's like a whiff of a wild world that connects to the wild world within me, but I could never put it into words.
The Roman numerals don't disturb me, they're no different than in any other deck. The handwriting is very beautiful and easily readable, why not sort according to the card title if you have difficulties with the numbers?
I don't know about different editions; I have a thick, smooth, wonderful card stock (and I had mine as present some two years back).
It's a deck I love. It doesn't always speak to me, and it's a meditative deck. I can't use it for trivial questions, but I rarely use the tarot for trivial questions anyway. All my readings with it have been spot on but there was always something left I couldn't really put my hand on. I like that, I don't want the tarot to spell out everything like Google translate. There is always something to intuit, to leave open, a little question mark that remains. You get an answer, but for me, it's not a pragmatic "now go and do XYZ" kind of answer like some other decks do.
I'm really happy with the deck. But that's such a personal matter. I'm sure there are many people who prefer other decks. I find the Natural World and the Luminia deck remind me of the Wild Unknown, others don't agree, but maybe one of them would be more in your direction?
I'd say give it some time. Make a deck interview and let it talk for itself. If after some months you still find it difficult, this is not a deck that will sit unloved in the trading boards...