I'm not sure if "formidable" is the right word for this. Lets review:
2005
Branch
Givens (missed 4 games)
Brown - also helped out in secondary
blah - Dwight, Johnson, Davis
2004
Branch - missed 8 games
Givens
Patten
Brown - played 2X the amount of D snaps as O
Johnson
2003
Branch - injured for 4-5 games, but only missed one
Brown - injured for 5-6 games, missed 3-4
Givens - was really an afterthough until around game 10
Patten - on IR after week 4
blah - Johnson, Ward, Stokes
Again, do these lineups have more sure things? Absolutely. But they aren't "formidable" by a long shot. Frankly, I would only put them at good when you factor in health and depth.