I like Letter 44, but I haven't had a chance to read the others. I've been trying to keep my pull at a reasonable level and there's just too much out there for me to follow any creator's full list of titles. And I hate myself for it, but I've been reading more from the Big 2 in recent years than I have from any of the smaller publishers.
Really though, Soule hasn't written anything I've read that I didn't like. Even the Inhumans book, where I didn't care for the status quo he was working with, had a high degree of quality. I just didn't like where the book was going (and to my knowledge that wasn't even on Soule, he just worked with what he was given).