In most European countries you need a 4 year university degree in criminology to become a cop. They have the same standards for average police officers as we in North America have for Federal law enforcement. So while it's certainly true that some European countries have shitty cops, the ones with stricter barriers to entry have slightly less shitty cops.
Here's an interactive map although it does seem to be missing a fair bit of data for Europe. The USA has the most abysmal Police training time at just 500 hours of training between being a civilian and being a Police officer.