@monorail i only know feedback from people whose first language is Japanese, because my friend has worked as a English‐language tutor for Japanese speakers, but what i’ve heard is:—
1. spelling is really hard; english spelling makes no sense
2. articles (a/the) are extremely difficult to get right. knowing when to use them and which one to use is one of the hardest parts of speaking English (for people from languages which don’t have them).
i think Europeans don’t like English because most European languauges are kind of samey and English isn’t really all that similar to French (compared to other Latin languages) or German (compared to other Germanic languages). but that’s a European bias towards European languages which wouldn’t be true for speakers from anywhere else.