I flat out disagree with you. Flat out. It's not simply the 5 losses were blowouts (and they weren't all blowouts anyway), it's that they were all bad. Really bad. As in, the team got down early in the 1st half, and either tried it's best to salvage the game but come up short because LOL at our defense -or- just flat out caved in for the rest (looking at the last 3 games there). When you combine that with the numerous close calls against mediocre teams, and well, it's a very legitimate argument. At least in my mind.
If it wasn't a legitimate argument, RR might still have a job right now.
Regarding your point about the defense, how do you know it would have improved drastically next year? You don't. A year of experience SHOULD help, but if teh issues run deeper than that (and I most certainly believe they did...), then would it have really improved to the point where Michigan was a legit B1G title contender? Or even a legit good team? '