TK-949 said:

I'm really happy with the german translation and voices. Wheatly is dubbed by Tobias Meister, one of my favorite Voiceactors, who has done the voices of Brad Pitt, Jack Black, Robert Downey Junior, Kiefer Sutherland, Gary Sinise, as well as Darth Maul in Episode I and Yoda in Episodes II, III and Clone Wars (both series).

Wow, that is weird to think about the same voice actor doing all those voices... you really should play it in English one go through though, to me Stephen Merchant totally makes the character of Wheatly, it would be a shame to completely miss that.