As it happens, I just changed one of the greens on a current remodel to a similar 3 tier green. It's a true 3 shot par 5 for most. Not only that, but I am building a side to side 3 section green a few holes later on a drop shot par 3. I hope they won't be rejected by golfers as unfair!
Actually, one 3 tier green used to be a staple in my designs, starting with my first effort as an assistant, and recently profiled by someone in the Best Chicago Greens thread. I have started to get away from them, not so much because I have heard too many complaints about them being unfair, but more because the trends in gca are towards more natural, and you rarely find a natural slope with steps like that, so they tend to look unnatural.
I have heard complaints, and concede, that if you are worried about proportional punishment, the tiers can reject a shot that doesn't miss by much to quite a distance from the flag. A gently rolling green tends to keep shots about where they land, so if you miss by 10 feet its easier than missing by 20, whereas, with a tier, you sometimes (rare) get a shot 10 feet short (or side) that ends up 10 feet, and 11 feet short ends up 90 feet back.
It does increase challenge, if not strategy, on short approaches, while increasing green size to minimize ball mark problems. By that, I mean, most folks would probably try to aim for the right tier, as purposely coming up short wouldn't yield any benefit, unless you go over and have a very tricky downhill chip, or something like that. So, I would never use a lot of them.
That said, and as someone mentioned, it dawned on me several years ago that many of RTJ's greens are really 2-3 tier greens, but he moved the tiers well, not just straight across as you often see (and as at Pasa 16) so many golfers wouldn't really think of them as tiers. Quite artful and difficult!