Based on my experience looking at Goodreads reviews, I think you'd have just as much luck with a random number generator.
1. White Noise at 3.86
2. Catch-22 at 3.99
3. Dhalgren at 3.77
4. At Swim-Two-Birds at 3.86
5. Midnight's Children at 3.98
6. Омон Ра at 3.90
7. Never Let Me Go at 3.84
Drawing the line at 4 rules out some of the most interesting books.
In my experience, you really have to fall below 3.5 to get consistently bad books, and even then it's not 100% guaranteed.
And that’s just the first author I checked.
Vonnegut’s Deadeye Dick (less of a crowd pleaser than his handful of biggest books, but certainly not in the bottom tier of his works) is under a 4. The A Man Without a Country collection, which is more of interest as a curiosity than because much of it’s good, is over a 4.
Yeah, you may as well flip a coin.
Imagine if a book is advanced Sci Fi, as in the concepts are built on exiting and other well known scifi books. The normal reader won't understand and think it's terrible. The actual target audience, Sci Fi book nerds, would love it.