I just raised my solo traveler rates a mere $5 a night (and reduced the per guest upcharge by $5 to make the two person rate stay the same), because I was tired of people picking my place just because it was the cheapest that showed up in their search. It may still be a problem though, because oftentimes they are searching a local city, which I will always be much cheaper than, since I'm 30 minutes away. But anyway, I have found (like others have mentioned) that people only there to save the most money tend to be the most critical. Maybe they don't actually read the listing, and just look at the price?
I seriously just got a 3/5 on value from someone who paid $51 after the Airbnb fees for a night's accommodations. I really don't know what people want. If you stayed in a hotel at that price, you'd likely get diseases and bedbugs =P Lol. My place isn't fancy or perfect, but it's much nicer than a cheap hotel (I've stayed in them before, ha).
I don't think most people understand all of which goes into hosting on Airbnb. They think it should be cheaper just to stay in someone's room for the night, but they don't think about the hours spent cleaning, doing laundry, communicating, maintaining the listing, etc. That was another reason I bumped my prices $5; just to make it a touch more worth my time. Now I will make $48 for week nights and $53 for weekend nights.
Experience really varies though, but even just the occasional negativity wears on you as a host, as almost all of us really try our best to make each guest happy. I am really getting tired of getting docked on cleanliness for pet smells, when the listing clearly states I have THREE cats (I clean the litter box constantly when I'm not sleeping, and put air fresheners in each shared room during the guest's stay). And Airbnb really needs to remove the location rating. That's the worst. I just got a 2/5 on location because he didn't realize how far removed I live (also clearly stated in both the listing and displayed on the map, lol).