Excellent thread and excellent points. I wouldn't recommend a Nano to anyone who doesn't have any SW experience. With such a small volume of water any amount of evaporation will have an effect on salinity levels which will affect inverts immediately. Another thing I notice with some of these types of tanks is the cover/lid which contains the filtration, it prevents evaporation leading to temperature and gas exhange problems.
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People need to know the filtration and size is not suitable to keep more than one or two of the smallest saltwater fish, and the lighting is not suitable to keep more than the lowest light demanding of all corals.
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Stocking levels of fish are probably the biggest problem. IME knowing the limits of your bio-load is something that has to be learned with time very few beginners understand this. SW fish is what got me into the hobby and it took a long time and alot of fish deaths unfortunately to finally understand that.