Did we actually just have a civil argument on here with a resolution? I'm impressed, gentlemen.
A quick look at the stats shows college teams average ~68 ppg, while NBA teams average ~99 ppg--a 45% increase. I agree with hat, though, that several factors more than make up for this difference. The game is 20% longer, the shot clock is 31% shorter, and the offensive skill in the nba is simply unreal. There are still plenty of posts that can clang an open jump shot, but the majority of guys can really shoot.
I'm not a huge NBA fan, but I've also tried to dispel the myth of "no defense in the nba" with friends. Even more ridiculous are the ones that argue it while holding up the 70's and 80's as the golden age of NBA basketball--when the defense was much, much worse.
My theory is that most casual sports fans are more into hero worship than the games themselves. They haven't embraced the current stars like they did Jordan, Magic, Larry, etc. They use the 'no defense' argument when they haven't watched much nba in a long time. Even though the NBA season seems way too long, the playoffs are usually very entertaining. These guys play incredibly tough, physical defense for sure.