My MBP is a tool I work on and if it had those issues I would return it. Why should I deal with it? It's Apple's problem. They can sell it as a refurb. If I have to return seven MBPs until I get a perfect one, they have seven more refurbs to sell. Their bottom line is not my responsibility. I wouldn't take a car with crooked trim from my BMW dealer, why should that be acceptable from Apple?
If a car's trim was out as little as these F keys I hardly think it would be noticieable. Returning a computer over a few F keys being out .mm's is absurd. Its not the same thing as a car door being misaligned.