As I write, and before re-watching the game:
WVU really picked on Terrell Edmunds and Mook Reynolds in the pass game. They didn't rise to the challenge often enough. That said, they're not pure pass defenders, and not many teams are going to have a QB-WR group that can exploit them this much. It's still worrying because the majority of WVU's receiving came from just a couple players, so it's not like the Mountaineers' depth at receiver was the difference. Definitely something that needs to improve before Clemson though.
The backup defensive line is pretty far off from contributing in a meaningful way. I wonder if we'll see more snaps from those guys sprinkled alongside the starters, rather than replacing the lines wholesale. As it stands, VT can't go from "good at four positions" to "liability at four positions" in one fell swoop.
DeShawn McClease was outstanding, didn't show any ill effects from the injury that caused him to take a year off. The running backs were used in different ways, so that may have helped his rushing average, but nobody else who carried the ball is getting positive yardage, much less a score, on his touchdown run. An impressive combination of power (for a little guy) and shake.
Josh Jackson is going to be fine. He probably won't have many other 100-yard rushing days (and the coaches probably won't want him to), but a 146.3 passer rating against one of the more confusing - not necessarily best, but confusion is a problem for young players - defenses he'll face is a good sign. That it was in his first game indicates he'll likely get better, especially since the run game supporting him can get better in a hurry.
Some young receivers showed nice things... they need to step up, get open, and make plays though. Cam Phillips can't do it all.