Two words, box art.
Sega managed to capture and distill the very essence of boredom with each and every piece of box art they created. Which is a shame because the actual games were quite good. I'm talking out of my ass here, but I'd bet money this is why the Master System failed in North America. Just look at this shit.
For comparison's sake, let's look at what the rest of the world got.
Oh Master System, we hardly knew ye.