It has weird sounds that makes it almost impossible for a non-native speaker to pronounce words correctly. Anyway it's not a language that other people would benefit from learning it. I wouldn't mind if it died out.

Don't like that it's not just a series of shrieks

Too much F words

The sound of the German language could be softer, when I hear it abroad I feel a bit of sadness that we talk in a way that sounds harsh in the ears of others, even when we say lovely things. But then there is the Dutch language...

Maybe the conjugations of verbs

I can’t think of a single thing that I dislike about it. Maybe the vosotros form. It’s equivalent to thee/thou. It’s weirdly archaic.

tonal languages are hard. sometimes you be wanting to say "pass the pepper" but then you end up saying "pass the pee"

when 'gh' sounds like 'f', wtf English

It's gendered and there is no neuter.