I was a huge Halladay fan and would like to support him (as if it matters), but I have not looked at his numbers case yet, and compared it to Pettite, Mussina, Schilling, and guys not on the ballot like Kevin Brown, who was close to his era (a little earlier). My guess is his numbers are worse than Brown and Schilling, similar to Mussina, and better than Pettite.
I've mixed in some old- and new-school metrics for these guys and deliberately left JAWS and WAR off as they're essentially composite stats. You tell me who belongs in. For a lot of people, the narrative at the end may end up making the difference I'd think.
256-153 (.626), 3.85, 26 complete games, 2448 K/1031 BB in 3316 IP. 117 ERA+, 3.74 FIP. 3 all-star games, 2 20-win seasons, 5 rings. PEDs.
211-144 (.594), 3.28, 72 complete games, 2397 K/901 BB in 3256 IP. 127 ERA+, 3.33 FIP. 6 all-star games, 1 no-hitter, 1 20-win season, 1 ring. Huge a-hole.
203-105 (.659), 3.38, 67 complete games, 2117 K/592 BB in 2749 IP. 131 ERA+, 3.39 FIP. 8 all-star games, 2 Cy Youngs, a perfect game, and a no-hitter in the playoffs. Won 20 3 times. No rings.
270-153 (.638), 3.68, 57 complete games, 2813/785 in 3562 IP. 123 ERA+, 3.57 FIP. 5 all-star games, 7 gold gloves. Won 20 games as a 39-year old. No rings.
216-146 (.597), 3.46, 83 complete games, 3116/711 in 3261 IP. 127 ERA+, 3.23 FIP. 6 all-star games. Won 20 3 times. 3 rings, 1 WS MVP. One bloody sock. Huge a-hole. Bonus points for being part of one of the most lopsided trades ever.
My take is Mussina (you'll see he was on my "ballot" this year), Schilling (same), and Halladay. Part of all of this is just the eyeball test: Halladay was the best pitcher out of any of them, Schilling wasn't far behind, and Mussina had the best single pitch out of any of them. But Halladay's an absolute no-brainer for me. The only thing that ever slowed him down was injuries.