I thought the defense played okay against FSU. Doesn't help that the offense/special teams gifted FSU 10 points. But I agree, they can play much better.
I'd call it like a C+ and if that is okay, then I agree. They were dealt a tough hand on a couple of those possessions but there is a lot there to improve upon. If you back out the points and just look at stats, it was still an uncharacteristically rough day. Travis and Webb avg. 4.84 yds/carry. Travis avg. 8.5 yds/att which isn't great but it's better than Book's 2018 season yds/att number. Which gives you an idea that it's starting to push up into the good/really good arena.
And, after a re-watch, the drive before half was pretty ugly. Then to get the rest at half, which is what I thought they needed, and to give up the TD right out of halftime, that's inexcusable, IMO. If the offense wasn't up to task to answer both those drives with TD's of their own, that game feels a lot different.
Consider this, if Book doesn't put together the best 2 minute drill he ever has (truly some of the best football he's ever played) to score before half, it's a 20-28 ball game going in. Then they score the TD out of half and kick the extra point. Now it's a 27-28 game. That feels a lot different all because Book was a Rockstar inside 1 minute.