I didn't compare them to Navy, I compared them (and their results) to the Big Ten opponents whom they've played (and lost to, with their current conference record at 0-6). Had the defense been able to play at a competitive level, several of those losses would have been wins.
This isn't a difficult concept unless, of course, people are more interested in deflecting than they are in confronting reality. IU's defense isn't Big Ten ready, and it basically hasn't been since KW became the head coach. I certainly hope that changes at some point, but denying this rather obvious reality seems to be an exercise in futility. A conference record of 6-32, with high performing offenses for most of that period, confirms that the proverbial elephant in the room really is an elephant after all.
As an aside, I ran into an old friend after the Michigan game who happens to be a member of their radio team. While complimentary of IU's offense, he openly wondered how UM hadn't scored 70. We had a laugh over his line, but he's a recognized football guy who was pretty harsh about what he saw.