Everytime I watch Gigguk's "The Perfect Anime" video, I hear TPK in the back of my head saying, "Your Favorite anime is shit because my opinion is fact."
"Dear reader, I hope this email finds you before I do."
full metal panic?
also, classics like TTGL, Code Geass or Evangelion, but you should have seen those by now and those include Mecha but are not about Mecha per se.