Any country can overrate their fighters. Take the U.S for example:

Lacy, De La Hoya, Taylor, Pavlik, Gatti (I know he's from Canada), Dawson (Ok fighter, but nothing special), Arreola (He's going to get hammered when he does fight a Klitschko), Berto (Same as Arreola he'll be exposed when he ups his competiton) Juan Diaz, etc. and many other fighters who are good, but they aren't as good as the hype. This list doesn't mean all U.S fighters are bad, they are guilty of over hyping fighter, just like every country. It's not just Euros.