It's tough to switch positions, and Irvin must be playing starter-caliber ball or he wouldn't be out there, but for what we're getting at this very moment, it doesn't live up to the draft slot. Especially when this FO seems to be able to get very very good LB play out of lower-round players.
I have a deep deep lack of trust in arguments that start with "I know he's invisible, BUT..." after hearing those the last 2 years of the Aaron Curry era. Earl is one thing, we've seen what he can do when QBs throw near him. Irvin is a different story.
We see Malcom Smith, we see Bobby Wagner, we saw KJ, all of those guys make a visible impact.
Not saying Irvin can't get there, and I buy that he's playing starting-NFL quality, but he's not playing at a Malcom Smith level or KJ level. And I'm not ready to assign him Red Bryant or Earl Thomas status where you know that guy being out is going to kill you even if they don't show up on the stat sheet.