What's wrong with the frequency? 60Hz means smaller, lighter motors and transformers, less flicker in iron ballast discharge lamps (less of an issue than it used to be) and no real downside. Also we have 240V here too, nearly all large appliances like ovens, cookstoves, electric clothes dryers and stuff like large air compressors are 240V. For whatever reason, US domestic service tends to be higher capacity than elsewhere in the world. A typical service to a modest single family home is 200A 240V. There tends to be less on a given circuit, for example my friend's house in the UK has nearly the entire second floor on one single ringmain, pop that and the whole upstairs goes dark. My house has multiple separate circuits for lighting on each floor, and multiple circuits for receptacles. If you manage to trip the breaker you usually still have lights.
Whatever the case, that (EE) friend and I have had some pretty extensive discussions on the matter and we have both come to the conclusion that neither system is a clear winner, both have advantages and disadvantages, mostly they're just different.