As with any offensive lineman, the time when people remember you most is when you get beat. And Eric sure got his a few times.
I wish we have all the tapes to evaluate him more fairly.
But he did got smoke at times, most noticeably on the sacks like by the Raiders.
However, he was also instrumental on several key blocks that resulted in TD for us, mostly on the run. I can recall some good blocks where he wins the battle at the LOS, but I can only acknowledge for certain those I can see in the reviews at nfl.com
What makes it even more difficult to evaluate is that we were really concentrating on running the ball more in the second half of the season. (Against mostly below average run defensive team, except for the Pats and the Jets, if I remember correctly.)
Honestly, I think my memory wants to reject the images from those 2 games (Pats & Jets). But, still somehow, I think Winston wasn't terrible in those games.
Seems like nothing really bad that really stand out.
What I mean is, from the limited view my angle can afford, the guy looks like a solid backup. Is he a capable starting RT? Possibly, at least he's not a red flag of a disaster (I think). Beyond that, it's too much more than I can assume.