Reading back through the thread, and apparently I missed the bold.
No.
I mean, not even close.
Downing was a nice player. Never a star. Everything he did, Ortiz does better. Bordering on insulting to say he was better.
Eh, it's a little insane, I'll admit but more to Senser's point, Downing was able to play some pretty decent defense when he wasn't DHing which helps his WAR a lot. Ortiz never contributed positively on the field or on the basepaths.
Ortiz: .285/.380/.547, 138 OPS+, 36.4 career WAR/30.4 7yr-peak WAR
Downing: .267/.370/.425, 122 OPS+, 47.8 career WAR/27.6 7yr-peak WAR
His longevity is actually far superior over Ortiz (although there's time for that to change). Would I put Downing in over Ortiz, looking further at it, no, probably not. But I don't think it's insulting.
I like Ortiz a lot, but I just don't think he's as statistical significant as you're stating him to be. He had awesome postseasons yes, but otherwise his numbers don't stand out above a crowd of people still waiting at the door. You keep talking about his incredible peak when in actuality, it's pretty pedestrian. It's really good, don't get me wrong, but it's not any better than the 7-year peaks of Lance Berkman, Jason Giambi, Jim Thome, Miguel Cabrera, Carlos Delgado, Mark Teixeira, Keith Hernandez, Will Clark, Fred McGriff, etc. I don't think that entire list is HOFers and all of them arguably had just as good of or better peaks than Ortiz.
Again, if it's a should/will argument it's a different story. Should Ortiz get in? Maybe, I'll have to look at the classes coming up and see if he'd be in my Top 10. Will he? We'll have to see, it wouldn't make sense if Larry Walker and Edgar are on the outside looking in but he's got the Red Sox/ESPN bump.