This is why I don't draft catchers in the 3rd round.
I'll say M-Cab is a disappointment, but if you were expecting him to have massive monster numbers thanks to the move to Detroit, then he would be the biggest disappointment all year. The Tigers' lineup overachieved some last year, M-Cab's moving to another pitcher-friendly park albeit not as domineering as Dolphins Stadium, and some guys take a while to adjust from NL to AL. In a dynasty or keeper, I really wouldn't worry about his stock. In a redraft, I wouldn't be kicking myself taking M-Cab, unless you passed up on Utley or Pujols.
As for Cano, I never could understand why folks consider taking him as high as the 4th round, given that he's normally a 2nd half hitter based off his first few years in the big leagues. Cano is a bit unlucky and I suggest buying low on him while you can.