I don't mind most of German except for gender+case+plural+whatever variables giving you like eight different forms of "the" and similar complexity for "a" and for adjective endings, and even impacting suffixes for the noun (end declinations). Having to think ahead to "okay what's the gender of the noun I'm gonna use three words from now...now factor in the case implied by the preposition preceding it...okay it's 'dem' + '-em' + '-en'".

Like I'm sure English has similarly complicated bullshit (the spelling is obviously a gigantic dumpster fire), but wow it's like a whole grammar domain I have to think about that doesn't even exist in English. It just feels like German has way more "modifiers" and variants of words.