R is the worst language.

* Indices start at 1, so you have to fix all your calculations by either +1 oder -1. It sucks

* Vectors and Lists are both neither vectors nor lists

* Data frames dont have a proper api. Simple operations like add or remove are a pain.

* The naming „conventions“ suck. Why on earth would add dots in your identifiers? You never know if its an object, a value, a function.

* The namespace is cluttered. If you import two libraries that deal with the same problem domain, it is likely that they define functions with clashing names that will overwrite each other defined on import.