Are you serious? I don't want to be impolite, but Matthes is the worst OH from Europe I've ever seen...of course, Brinker is very unstable and Beier is not a good attacker. but as you watched, Beier improved quite a lot in last WGP. about Burchardt...She was mostly substituted only in hard moments or when Germany was losing the set. It was a big pity as well. as Kadir said, Beier-Grun duo would be great.
I don't think that she is the worst OH Brinker is OK for me she is still young but Matthes is much smart attacker than Beier.She knows how to avoid block not like Beier.Beier does 3 attemps and 1-2 are mostly get blocked I don't think that she improved.She is still same.Beier is not a player of this level IMO For Example Turkey-Germany WGP 2011 Qualification tournament as i remember correct Beier started to game with 0/5 or 0/6 and after Matthes replaced her and played the whole match and Germany won 3-1.If Guidetti gives her more chance to play Germany might have diffrent results