Not a joke.
1) TTGL doesn't have the obvious plot holes of Code Geass. Therefore, TTGL has better writing than Code Geass.
2) TTGL has more interesting characters. Lord Genome, Simon, Kamina, etc are far better characters than Lelouche and co. This further indicates good writing, because the author knows how to develop likable characters. Suzaku just wants to make me RAGE. All the female characters are just fap material. And Lelouche is a Light Yagami copypasta.