Seahawks have hit on pretty much all of their 1st and 2nd round picks the last 5 years.
The two that come to mind off the top of my head who haven't been great are Marcus Tubbs a DT first rounder in '04 (he's good when healthy, just hasn't been healthy) and Chris Spencer a first rounder in '05 who hasn't been all that good at Center this year.
But by and large they've hit, a big reason why they are good.