Sorry to necro this thread now, rather than replying back in May, but...
The Black Library is a rum do. Very variable quality. To be honest I view most of their titles with caution. I have a small collection of 'classics' - Gotrek, Eisenhorn, Ragnar etc. - but for a while afterwards I managed to pick up a string of turkeys. Among others there were Caiaphas Cain (hilarious in the Inferno! short stories, but insufferable in novels), A Murder in Marienburg (I read two chapters, threw it against the wall, and swore off the BL), and the first Darkblade novel. (it lured me back, but Dan Abnett's name on the thing is some red herring)
Speaking of Dan Abnett, he and Graham McNeill are two safe pairs of hands, IMO. The only two BL authors I really trust enough these days, to shell out for before browsing or borrowing. They drew me back to the BL a second time, after I borrowed a copy of Titanicus, and bought the Ravenor omnibus and Mechanicum. (the first Horus Heresy novel I tried, being opposed to the sweeping away of the mystery and legend of that time) At the mo I'm waiting for Priests of Mars to turn up in paperback (I like the Mechanicus! But not an extra £10 for two bits of card), and I notice there's a new installment in the Eisenhorn/Ravenor cycle. (can I call it a 'cycle' at this point?) Looking forward to those.
But, yeah. It might take me another while to warm to the 'one novel/series for every SM chapter!' thing they've got going on.