Who else?

Dub of K-ON! without the character of the japanese voices actors :/

In that video all of the american voice actors sounded the same >_<

Not to mention all japanese humour will be stripped from the dub

e.g. "Shoppai" joke in the beach episode in series one, about the workd "shoppai" being misinterpreted by Yui for something else, which is why she exclaims "It's the salt, ricchan! The salt!"