I don't suggest anything, because there's nothing you can do about it anyway. You can't expect everyone to think rationally and to understand how Airbnb works and to rate your property similarly to how you would rate other people's properties. It takes all kinds, and unfortunately you're going to get a few of those staying from time to time.
I think the Superhost program is reasonable enough that it takes this into account though. If 20% of your guests are weird and under-rate you, you'll still claw back with the 5-star reviews.
I get the same frustration, and I used to take it to heart too. .. Bizarre, fantasy-world people who complain about the location despite being 5 minutes walk from cafes or a minute's drive from centre of town. People disappointed with the value, (which by the way, I notice those that make this complaint are almost always the ones booking during my off-peak discounted rates), I really wonder what they expect for $80/night when the same thing offered in a nearby hotel is $120-130.
And curiously, I've even noticed several times that I get disproportionately "bad" reviews from other fellow Airbnb hosts in my own state. One couple paid peanuts that barely covers my bills and cleaning time, and they were "surprised" that I don't also supply breakfast. I mean... I know that some of you guys have a ridiculous overactive passion for doing this, (which I commend you for), but I would have to think some of you are making a loss on the entire venture because you're happy to PAY to host people 🙂 ... So, to those passionate hosts I'm happy for you to leave free-range eggs and freshly squeezed juice for your delighted guests and only charge them $80/night, but some of us really have a budget to keep, and it's unsettling that I should get a "bad" review for that fact of life.
But, you learn to cop it on the chin, and take comfort in the reviews from guests who really appreciate all that you do.