Words commonly written in katakana,
are annoying because you have to read katakana.
Due to the shapes of the characters,
reading katakana is more difficult,
especially long katakana-words.
Even Japanese people hate reading such words.
With training, you can get used to reading any alphabet, but it's inevitable that a badly designed alphabet takes longer to adapt to.
Maybe one day Japan will switch to the Cyrillic script. Until then, we have to deal with what we have.