Negative reviews on e-books?

I've been reading some stuff on my Kindle, mainly stuff I've picked free from Amazon, new gritty and noirish crime fiction from both side of Atlantic. I've liked a lot some of the stuff I've acquired, for instance Juaréz Dance by Sam Hawken and Tony Black's bleak novella The Storm Without (of which I didn't do a blog post). I also liked Lawrence Block's short story "Keller on the Spot" quite a bit.

But I've recently dropped two novels by new noir writers I was reading on Kindle. The other one was sloppily written and edited, and the other one had ridiculous characters and the police work depicted in the book wasn't believable. I was going to post a review of the books, but then I got to thinking I wouldn't be doing much of a service to the writers and their publishers (the other one of the two writers has just a book out from a small publisher working actively in the neo-noir business). Then I got to thinking that as a critic that's just what I should be doing: pointing out what these writers and their publishers are not doing very well and keeping readers out of the bad or mediocre stuff, but then I got to thinking again and then I decided not to post.

What do you think? I'm really an outsider in these circles, since I'm essentially a foreigner to all American, British and Scottish writers mining this area, but then again, someone might benefit from my point of view.