If most airport checkpoints are useless security theater, the worst airport in the US is a high school version of Our Town, and Frankfurt airport is every Cirque du Soleil playing simultaneously at the Bellagio with Celine freakin' Dion singing on your lap.
Stay far far away.
We made it eventually, but I'm about to collapse as I type this. Also, the Mercedes B-Class will have to wait; Sixt discontinued them a few weeks ago [not that they bothered to remove them from their reservations site, of course]. We got a 5-door BMW 1-Series instead, and so far it rocks. Pleasant surprise. [btw, did you know I've been writing a travel journal/column about these back-to-back overseas trips at Babble.com? There's a bit of a publishing pipeline-related timelag, but there's also an abundance of chatty details and advice for toddler travelers. Check it out.