I'm really of two opinions on this. In terms of "hey, an album appeared that I didn't wanted", meh just get rid of it. In terms of "hey, a company whom I am a customer of basically dropped a package on my device for free", well that's not as cool.
So in terms of the current negative publicity, I'd hope that the current backlash makes them and others think twice about doing so in the future. It's like companies that - after I buy a product from them using paypal - have decided to bomb my paypal email address with ads for other shit I don't really want. It's a new form of SPAM, and certainly not something we need. What if it wasn't a big-name artist?
How would people feel if Apple decided that maybe you want "Best of American Gospel Music"? How about if there wasn't a huge backlash, so they signed a deal with a few dozen other bands and decided "hey, let's drop a bunch more stuff in people's accounts, it's *free* so that's OK right?"
Companies like Netflix make "suggestions" based on your history. If Apple wants people to hit a "Suggested for You" section and a "Free/Promotional Music" section where people can browse, that's cool. Jamming it into somebody's library for a marketing promotion is spammy and breaks the lines between "your service" and "my account".