Here's where Lannan's ERA+ (park/peripheral-adjusted figure) would rank him in the rotations of contenders in the NL:
Arizona: 3rd
LA: 5th (FWIW, he's nearly tied with Lowe, and Eric Stults has only had 6 starts, but damn, that is one loaded rotation)
Stl: t-2nd
Mil: 3rd
Chi: 4th
Phi: 3rd
NY: 2nd
Looking at this, to say he's "at best" a third on a playoff team when he's only 23 is laughable and ill-informed. Differentiating a second from a third or even a fourth is a fairly pointless exercise, anyway. The aim of a team with championship aspirations should be to have one outstanding starter, three above average ones, and one who can merely give you a chance to win on a fifth day. It does help to have a lights-out top 2, but that's asking for a lot.