Quite true! 'Perdido Station' was my first Mieville novel, too, and it was definitely a love/hate thing. While I really enjoyed his style and was intrigued by the setting, the story was a bit too 'grimdark' for my taste. That's why I delayed reading the next novel using this setting (Leviathan) over a decade. However, when I finally did read it, I was immediately sucked back into the great setting. I also liked the story better.Perdido Street Station seems to be one of those books you love or hate. Or maybe love AND hate it. It was my first Mieville, and none of the others that I read have hit those same rarefied heights. Or maybe it was just in contrast of reading too many "our elves are different!" (but everything else is the same) fantasy books at the time.
I also really liked 'Embassytown' because it's built on such a fascinating premise; I enjoy stories that get me thinking. 'The City & the city' also featured a rather unique premise, but was ultimately a bit underwhelming.