This response is exactly what I expected. You fail to grasp even the most basic elements of evaluating performance.
1) You don't understand the broader context. College football has changed. The average team scored ~30 PPG last year. It's not the 1960s. So we had only 1 game last year where our defense gave up more points than average. (Ideally we would make this comparison on a team by team basis, vs compared to all of college football, but I'm investing enough time in talking to an idiot on the internet as it is.)
2) You don't understand what the right metrics are. Offense and special teams have a huge impact on points allowed. Yards, yards per play, and the advanced stats are necessary in order to tell the complete story. For example, in the VT game, we only gave up ~330 yards. Our defense certainly didn't play great in that game, but the offense's 5 or 6 turnovers had a lot to do with the 42 points allowed.
3) You fail to look at the overall body of work. This is unbelievably basic, but I'll spell it out. You can't look at only the worst performances (which weren't all that bad, as per points 1 and 2 above). But we held UF, UVA, FSU, and other teams well below their scoring (and yard) averages.
The 2002 Hurricanes defense gave up 45 points to VT. So I guess by your estimation that defense sucked, too.