Snapping, blocking, or total? I think it's more of a continuity thing from the snapping point of view but he is no where near the protector that Clint was.
I don't know a lick about long snapping but just using common sense and what I've seen on TV, the snaps have been very inconsistent in both accuracy and speed. I've heard a time or two that the snap was slow and of course we can all see when the snaps are not accurate. Both of these lead to missed points because the kicker and holder have to adjust and when they are dealing with milliseconds there really isn't much room for error. Football is a team sport and no one person should be accountable for wins and losses but... based off the past years where the kicking unit has been the most consistent part of our game (which is why we call Stephan "HauschMoney" ) and the only difference is the long snapper that everyone would have to agree that the bad snaps have cost us points.
But his accuracy this year is 89.2% which is what his average has been since he's been a Hawk. What the stats don't tell is how many misses in the past were long "Hail Mary" type kicks compared to this year where it seems most of the misses are because of bad snaps or the defender blocking the FG up the middle.