It's funny that Fielder's contract is being praised in the same breath that Panda's is being criticized. For all the flack Panda has taken for being fat, Fielder is even fatter. He is arguably a much worse defender than Panda is, outside of this season. Also, his contract is twice the size of Panda's.
As far as Verlander and VMart still being pretty good, Verlander is being paid approximately $25 mil this year for a 0.8 WAR, a 4.11 ERA, and a 4.45 xFIP. And he's signed for four more years. He may bounce back, but he might not.
VMart is being paid $17 mil this year for a -0.9 WAR and a -50.8 UZR/150 (very small sample size). He is signed for 3 more years. He may also bounce back, or not.
The point is, those contracts currently look every bit as bad as, if not worse than, Porcello's and Panda's.