Like, sure, slop does *on average* have a bit of a "quality smell", as it were, but the low quality is downstream of the definition, which is that it was extruded through an "AI" in the first place.
To my mind you can make slop that is delightful, inspiring, moving, extremely functional, bug-free, etc. That's a big part of the problem; it's not always possible to tell. You *usually* won't, of course, it's usually bad, but that's not always true.