My wife says the same thing...calls him slimey.
Chris Matthews points out that everything from Rubio seems well-rehearsed and not spontaneous at all. He gave some examples. He's right. He's just not the exceptional person for the job by any stretch.
He does sound very scripted. But it could just be over-preparation. I say I'd be happy any of those three... Cruz, Trump, or Rubio. Then my wife says, Rubio is slimey. Hard not to trust her intuition.
She's sizing him up from a completely different, just as valid, angle. She may pick up his extreme ambition, which translates in many telling ways that you feel more than you cognitively recognize.
^^^ how's that for some pointy-headed ivy tower bullshit?
Which begs another question: does Ted Cruz secretly look down at Rubio? After all, at Harvard and Princeton he was said to refuse to study with students from lesser Ivy League schools. His wife was a Goldman Sachs bigshot. He clerked for those "5 unelected lawyers", living in D.C. He argued before them, convincingly. He worked for Bush in D.C. In any way you measure it Ted Cruz is an elite member of the insider class. And then next thing you know he's in a duck blind with the Fake Cajuns and cooking bacon on the end of a gun. He's a totally contrived, calculated person playing people for suckers. He will try to be whatever he needs to be.