I don't think either Pettitte or Haladay deserve to be in the HOF. Both guys were great but not HOF great. Halladay had a couple great years, so did a lot of guys not in the hall. Pettitte was my favorite lefty to watch pith and had a very good career, not a HOF career.
Nolan Ryan was interesting at best. If you like strike outs and walks he is the man. He had some amazing games but also is the career leader in walks and hits per 9 innings. That is right nobody gave up more hits per game than good old Nolan, he led the league 12 years. I am also sure Jose, Juan, and Ivan would all say he was PED free while teammates.
EDIT: I read the hits per 9 innings wrong and Nolan led the league in giving up the least 12 times. Still not a fan of Mr Ryan.