Nah, I'm serious. But I may be just a little biased because I am from Frankfurt myself. I have been to a lot of cities, but I just like Frankfurt best. Mainly because of the hessian culture. (Is that correct? I don't know the translation for "hessisch", Goolge said hessian xP). There is even a building that looks like a glass you use for drinking apple wine. People just call it "Geripptes". I love that. We also have the best food! Franfurter Grüne Sauce is the best meal that was ever invented. Period.
I know I might be in the minority, but I still like Frankfurt a lot. =P
I'm from Giessen originally myself (70km away) and I always thought Frankfurt was one "assi" and ugly city (GI isn't much different though, minus the scyscrapers ;). Not debating there are some nice areas where the bombs didn't destroy everything, but hell...even in Germany there are countless placed i'd prefer to live in, especially in terms of objective "beauty". But hey, I also don't like Grie Soß. ;D
But I sure do love Hessisch people...So..Ei Guude! =)