As a country, we have assumed many things from the US -- some good, some not so good, some downright awful.
Within the latter category, I would suggest the TV political debate. First of all, they're not debates. A debate revolves around a motion, supported by a proposer and a seconder; yet another proposer and seconder argue opposition to such motion; and then the debate is thrown open to discussion by an audience. No such traditional convention exists in the so-called 'debates' on TV, which are simply turgid verbal sniping episodes.