Excellent post! This is one of the first trades that I bought when I was first getting back into comics a couple of years back, and I absolutely loved it. It's a perfect idea for fans of a funnier Joker, which I am. I like my Joker like Jack Nicholson and the DCAU version. Funny, clown-like, but still quite creepy, sinister and deadly, and quite obviously mad. So this was perfect for me. The odd thing was that the book seems to take the idea of the DCAU Joker and mash it together with Dark Horse's actual Mask series, which was quite violent, gorey, and not really that lighthearted, but for people more familiar with the Jim Carrey movie (not so much that pathetic sequel with poor Alan Cumming, Bob Hoskins and Tea Leoni), I suppose it works fine.
I do love this book's version of Ivy, though, and I think it sets my standards for what I like to see in the character, with perhaps the exception of the green skin (which I prefer to leave up to a whim of the artist) - In that she's attractive, sexy, intelligent, and funny, and perhaps a little too ambitious for her own good at times. Also? I LOVE barefoot Ivy (foot-fetishist here, yes, but not because of that), because it just seems to make sense for the character, to me. She wouldn't wear some plasticky or leather boots or whatever, and the little elfin booties and the green tights never worked for me.
Also, I did describe her as sexy, which I think a character like Ivy should be, given who she is and what she does, but I do like it when she isn't used solely in a sexual purpose, like she was in say, Hush, where Loeb obviously took delight in implying 'HEHEHLESBIANSHENANIGUNS' with Selina. This, on the other hand, works really well because she looks great but that isn't all she's there for. The only time she acts sexually is trying to get more information out of Kellaway about the Mask.
So I loved this, and I'm glad to see someone else enjoyed it.