Personally it just wasn't my style of fantasy writing. Honestly it just wasn't. It wasn't too dark. I've read similar novels before. The entire novel just wasn't my taste.
I also felt Tigana was too much for a single book, the ideas and plot dragged. I didn't hate it it was just average which was rather frustrating because it seemed that Kay was such a wonderful writer only the plot he used didn't appeal with me.
Still I'd be interested in reading other Kay novels simply to see what his other work is like.