I agree. I've used Band-in-a-Box for years but strictly as a practice tool.
It's great for training you to switch keys and work on scales and such.
Like you say though...to anyone who has used the program before, the music styles are instantly recognizable to anyone who's ever used it before.
So I wouldn't use it in any publicly released song.

Same thing with GarageBand. There are too many amateurs using the generic loops and after awhile they become recognizable to people.

Even using royalty free loops is a risk in releasing your own tunes.
When I first started doing songs I was using a lot of factory loops included with software such as Halion etc.
On one of my songs "Rocksplosion", I was freaked out to actually hear one of the loops I'd used in a Mop commercial on TV once.
Since then I've heard several of my early generic loops used in TV commercials so I've made it a point now to create my own instead.