Why does everybody hate the idea of multiplayer in TS5?

Because I don't like multiplayer. Especially not for a game like The Sims, which is such an iconic singleplayer franchise. Making it multiplayer would mean that it isn't The Sims anymore. It just wouldn't be the same game, the same feeling. I play The Sims to have complete control over MY OWN world and to escape reality and other people for a little while. Mixing The Sims and multiplayer would definitely make me say goodbye to the entire franchise.