To be fair, I think it should be a system that had a minimum of 50 or so games for it. Which system had a library that pretty much sucked?
For me, I might pick the Atari Jaguar. True, they did have a couple truly great games (Tempest 2000 and Alien Vs. Predator specifically come to mind) but can you actually name more than a handful of good games? Do the titles "Fight For Live", "Air Cars" and "Club Drive" ring a bell?