I know, I know, ragging on science fiction and fantasy novels for their covers is like shooting fish in a barrel (link courtesy of Rocketpunk Manifesto). So I will focus on just two series that I absolutely love, but whose covers (in the editions I have) make me want to whip out the brown paper for fear of being seen with them in public.
One is Bujold’s Vorkosigan Saga itself. This cover says it all. (Thankfully, I don’t actually have that edition; I have this marginally less bad omnibus.) Split Infinities has plenty more examples, and makes the point that the covers repel readers who might otherwise pick up the intelligent, character-driven stories within.
The other is the Black Company series, by Glen Cook. Again, I’ll let one cover do the speaking for me. To add insult to injury, the Black Company novels were recently re-released in omnibus form – with much better covers.
So what would I consider “good” cover art? I’ve previously held up Discworld as one good example. Others include the clean, elegant look that Bloomsbury took with the “grown-up” Harry Potter covers, and the simple design on the more recent UK edition of A Game of Thrones. I just wish there were more of it around…