While I agree that was the case for a rather long time, I have recently been surprised to see a marked improvement in Burger King's offering (in the UK at least). The stores are clean, the food is better - to the point where it was actually much nicer than McDonalds.

I only noticed maybe seven or eight months ago when it was the only place available for a quick meal, but I've been back once since, at the other end of the country, and it was also good.

I suspect these things are a bit cyclical.