Take a look at the link chrisk posted:
I think Brown's really underrated.
WAR: 37th (Halladay is 45th)
WAR7: 58th (Halladay is 40th)
JAWS: 47th (Halladay is 43th)
I rank Halladay ahead of Brown, but not by much. Considering there are 57 HOF pitchers, an excellent argument could be made that both deserve induction.
(Of course, if a person believes that 40 or 50 of those HOF pitchers should be kicked out, then I understand why they'd be against Halladay or Brown getting in. But based on what the reality is, on who is already in, yeah, these guys deserve serious consideration.)