If you've followed Perez during his career you'd know he's anything but consistent. Was last year a fluke regarding John Maine's performance? Their 5th starter will be either Hernandez, Sosa, or Pelfrey... not exactly intimidating.
I'd go with no as far as them being flukes last season. Perez is actually a solid pitcher who was on a bad team without really good coaching. Maine is a very solid up and comer. I dunno about Pedro though. I don't think he has much left. I see him as the 4th starter. As far as a 5th starter goes, I don't think there is a team in the league with a concrete, solid 5th starter.
I would've rather seen Johan go somewhere else, but IMO, the Mets now have one of the top rotations in the league. I could see Johan winning 23-25 with this Mets team barring injury, which is rare for Santana. I had him on my fantasy team last year. He had 1 or 2 stinkers, but every other game he was pretty solid with no run support most of the time.