It does always seem to go to the Boeing vs Airbus thing but there have been several losses or near losses of 737's with rudder hard over problems and they were not fly by wire issues but hydro-mechanical (I'm sure someone will be able to correct this assumption for me
) and no amount of manual reversion would have saved them as the solution was in fact not to pull but push in order to get better response from the ailerons ( I think that makes sense but see above proviso..... )
Any system can and will be subject to murphy's law and having done more than 5000 hours on the bus I am pretty satisfied that it will look after me.