Tons of games are repetitive. All that free to play stuff. MMOs. Old arcade games.

Tons of games have super tight "gameplay loops". Super meat boy - try, die, repeat right away until you win. Over and over and over again. Every level is just a variation of something before it.

I don't think people dislike repetition at all. People repeat stuff all the time and like it. So there must be something else going on.