Nice post. Like you said, comparing to last year is not always very fruitful or accurate. I think comparing common opponents that were played at different times of the year is also not very fruitful in the college game. But you bring up some good stats.
With regard to your +/- question - we lost 2 really good LB's and a really good safety and corner on defense. The DL improved, and linebackers are still very solid. We still have our best LB, Payton Wilson (#11). Irish fans will love this guy. Big, strong and athletic, plays with a mean streak. Our two corners are very good this year. But we did lose 2 defensive starters who made NFL rosters, and 3 more on practice squads. I do think overall, the defense will be about the same in terms of production. Possibly a slight dip. All of our defensive replacements have played a lot of snaps, so that is encouraging.
On offense, tough to compare the QB's because we had to play 4 last year due to injury. We lost Leary early in the year. Armstrong is a good player, so I think considering last years injuries, we improved at QB. The offensive line is slightly improved, but not dramatically so. Frankly the jury is still out on that. Our RB room is the same. We have a deep stable of solid backs, but nobody that is a stud, at least right now. We lost two good wideouts, so I think WR took a dip from last year. We do have a lot of talented wideouts, but we don't know who will emerge as the star. Given that we lost 2 proven guys it is tough for me to argue our wideouts are not a - from last year, at least at this point.
We are not better than last year, which was an 8 win season only because we had to play a 4th string quarterback in at least 4 games. I do think we win about 8 this year. I think we win 9 if we are lucky. No chance at 10. But you will need to beat a 10 win type team at home, as we historically play up to our competition in Raleigh. The sentiment of our fans is basically, don't get killed, try and keep it close, and if we get lucky with some breaks, hopefully have a chance at the end. If we cover I don't think anyone would complain. I just hope we catch some breaks and play well enough to find ourselves in a dogfight at the end of the game.
I look forward to watching Hartman again, as he was always one of my favorites to watch. He does like to throw us the ball, but then he makes ridiculous throws that spark his team. He will need to turn it over at least twice for us to have a chance.