They always have a good D but they don't have a dominating one as before...
Not sure what year you're watching, RayClay? "Not as dominating as before?" They are
way more dominating on defense than they were last season when they won the SB, as you said the difference is their offense--which isn't as good. Our tendency to make opposing offenses look all-world is concerning however.
Here are just some quick stats regarding your "not so dominating" defense:
--#1 in first downs allowed per game
--#4 in red zone defense
--#3 in 3rd down conversions allowed
--#6 in points allowed per game
--#7 in rushing yards allowed per game
--only allowing 227 passing yds per game, definitely top 10
--#9 in overall "total" defense, determined by overall yards given up
--Both Suggs and Dumervil (9.5 and 9) are closing in on double digit sacks for the year
I didn't think there was any dispute that they've improved in several positions on defense from last year. The acquisitions of Daryl Sims, Chris Canty, Elvis Dumervil, Matt Elam etc, are coinciding with returns to health from Suggs, McClain, Webb. When you add those players in to the staples they already had like Ngata, A.Jones, Graham, etc they are making up a pretty formidable defense for sure.