to me adequate means average. if someone's below average they're inadequate.
Do we get to devolve into a discussion of arithmetic mean vs median average? Because I feel that's where we're going...
Arithmetic mean, sure, Newhouse might be below average. But I bet he'd fall right in middle of the median.
The problem is we have Joe Thomases and David Bhaktiaris with their 99 Madden ratings skewing the mean. Compared to those guys, and other elite left tackles, yeah, hell of a step down. Quite the step down from 2010, broken down and duct taped Chad Clifton.
But that doesn't mean below-average. He's still kicking around the league. He must be better than a great many other linemen who have come and gone. Hell, the dude was a 5th round pick in 2010. I'm sure the teams he's played for have tried to replace him. And yet, there he is.
(And then we have the problem of defining what average is when we can't just compare Madden ratings...or any number, for that matter)
To me, he's the prototypical average, journeyman offensive lineman. Exactly the person a team would sign for a backup, number 3 swing tackle. If he were younger and/or better, he'd be getting starter money to be a starter somewhere.