Javascript/PHP are broken compared to C#. Python, Java and Go are verbose and clunky in comparison (although I appreciate being able to write self-contained native code in Go for so little fuss compared to C).

My hate is Python being used for anything outside scripting. Package management is archaic and broken, the quality of libraries is mediocre and the language stewardship has been poor. Particularly the way the 2.x > 3.x migration was handled. I'm still bitter about that. It remains one of the few ecosystems where picking up a project older than 6 months is playing a game of Russian Roulette as to whether you get it working within a week of messing around with broken code and dependencies.