Grimlock, people do tend to abuse rental cars. I'm not suggesting the poster who posted here abused the car, but it's certainly possible that previous drivers did. Again I say, a disappointing rental experience is the rental agency's problem, not the manufacturer's.
I get it, you're pissed off about your new car being less-than-perfect, I would be upset too... but I don't think you need to carry the torch for "JamieB" who will most likely never post here again, and you certainly don't need to be rude to people about it.
The washer fluid is NOT fine!