Now let's look at the investment in our secondary. Polamalu was a R1 pick. Ike was a R4 pick. Clark was a FA who went undrafted coming out of LSU. Cortez was a R4 pick. Gay was a R5 pick. Shark was a R4 pick. Now, Clark is (was) a better player than his UDFA draft status, but your entire secondary is a bunch of third day draft selections. I think Cortez will rebound, and Shamarko will turn out to be good, but the investment by Colbert and Tomlin in top tier talent is AWOL. If the receivers are open, the QB can get the ball off, and it doesn't much matter what the F7 does.
There seems to be this nonsensical trend where the Steelers believe that they can go for years without a high draft pick or serious FA signing at one particular position and get away with it (See: Offensive Line/Defensive Line). Then, we spend picks to fill up that position (See: OL/DL) and we realize that the picks were not that good (See: OL/DL). Particularly from an ROI perspective. You end up putting all the chips on the table for a certain position, and if you miss, it's a fiasco (See: OL/DL). If that's what they're doing at defensive back, then they'd better make a hit with this draft.
Not saying Jarvis is a bust, but we had Worilds and Woodley already. We could have taken a guy like Xav Rhodes, who's played pretty well and fits the physical style of CB play we favor. We could have taken Deandre Hopkins, who is the anti-Sanders, and could have been the clutch sort of go-to guy we need to pair with Brown. Sure, Jarvis was a "great value," if you read the draft web sites, but in reality? Not sure.
Argued with the bro-in-law, a huge Dawgs fan, on this one. Didn't like it, even when everyone called it a "no brainer". Preferred Hopkins, Patterson, or some offensive lineman that could actually block. Hope he proves me wrong, but pre-draft reports seem to be accurate. Not nearly as fast or strong as he looked on Saturdays. And is he really an upgrade from the two you mentioned? Hope I end up being wrong in the long run.