The Fifth Head of Cerberus

I found the first story very good, but a little boring and not very credible in the mix of 19th century+future (in the New Sun series there are good reasons to make that believable, but here they are not). The second story is utterly uninteresting and unreadable; the third just very boring.
I love GW in his Sun series, but this book was a big let-down for me.