I agree with you. SEC does have the largest share of BCS bottom-dwellers. Ole Miss, Miss State and Vanderbilt are all currently like that. Kentucky is actually a .500-quality program right now, but we'll see how that lasts.
Still, the SEC has...
Florida - Probably the second most prominent football program in the US besides USC
LSU - Consistently the most talented football team in the US, even though they don't have the record to prove it
Georgia - Always talented and in the discussion for the SEC championship
Tennessee and Auburn are almost at that level. Tubberville needs to be a little more consistent with his talent. Tennessee is a good coaching staff away (READ: I DO NOT MEAN FIRE FULMER) from reaching the top of the conference.
On the way down: Arkansas' problems with Mustain and CHN are going to set them back... I don't see Kentucky getting any better. They will plateau at best, if not slide back down to being Kentucky.
Then the bottom dwellers.
Point being: Even though I believe the Pac to be the second-best conference, the SEC has 5 teams that would consistently finish 2nd in the Pac-10. Alabama and South Carolina would be top-half teams, too.
So while the SEC does have more dogs**t programs than any other BCS conference, it has too much talent at the top to ignore.
I don't agree that the SEC has a larger amount of "bottom feeders" than other conferences. For instance....
Big ten
Northwestern - save a small run in the late 90's what has this program accomplished.
Illinois - in and out of low tier bowls, have the zooker at the helm.
Indiana - I am not sure of the last time they were in a bowl but it hasn't been in the last decade.
Big twelve -
Baylor - On the level of the Mississippi's, but didn't have the success of those two school in the late 90's.
Kansas - recently scraped into the bowl pool, but a pretty dismal program
Iowa State - same as Kansas.
ACC
Duke - Need I say more?
UNC - pretty consistently bad over the last 20 years with a few bright spots now and again (mack brown)
Wake - Try and forget last year and you will agree that this program was on par with Vandy.
Pac 10
Stanford - has been horrible as of late
ASU, Zona,WSU, Org. St. - except for each programs blip on the national scene the last 20 years, each alternate in and out of the level of the SEC cellar dwellers.
Big East...no reason to even start.