A few points
Baas looked like he was injured early in the game, he was playing kind of tentative after the first 2 series. I think his neck was really hurting.
While there were a lot of missed blocks, and what looked like missed assignments all over the place, i will say that Arizona was absolutely selling out to stop the run.
They were walking up the safety late a lot, and ran a ton of run blitzes. Truth be told they took chances and guessed right a lot.
I attribute a lot of the missed assignments and bad blocking on the Cards aggressivness to stop the run.
Late in the game, (and Dockett being hurt helped) they sat back when they knew the Giants werent going to run, and Eli picked them apart.
So basically, yes the OLine did not play well early, but you have to give the Cards credit, it really looked like their D gameplan was to sell out to stop the run.