I was just thinking about this earlier tonight: by the time The Cube gets underway, Minute To Win It will already have a season under its belt, and some sort of recognizability. Because if this, viewers may see The Cube as an overly serious knockoff of Minute to Win It, although MTWI is the knockoff.
Right now, Minute's got a few things going for it- the show's pacing has improved, Guy has become a better host, the contestants are likable, and (maybe most importantly) people can play the games at home themselves. NBC is trying to push the latter point by inserting an on-screen graphic before certain games, telling viewers what materials they need to play that game at home.
This sorta reminds me of the "music game show" situation a few years back. IIRC, and please correct me if I'm wrong, when The Singing Bee was announced, FOX rushed Don't Forget The Lyrics to air. Although the general consensus was that The Singing Bee was the better show, it folded way before Lyrics was cancelled (although both have been resurrected).
Since NBC has announced it will air new episodes of MTWI throughout the summer, The Cube will have to compete against the show that it partly spawned. So, I pose this question to you- is The Cube in trouble from the second it premieres? If so, what does CBS do to combat it?