It isn't accurate. There are examples of teams that suck defensively, any team coached by Mike D'Antoni, really the Cavs aren't all that good defensively outside of of LBJ now that Varejo is out. But defense wins out at a higher rate in the NBA . Also, it is worth noting that there are certain big rules in the NBA that strongly encourage defense, the verticality rule, and defensive three second call. Whereas neither of these exist, or in the case of verticality are apparent. Also, the talent difference between the offensive talent in the NBA and NCAA is pretty extreme. You aren't really comparing similar levels. The players in the NBA are the best in the world at what they do, there are so many college players that will never sniff the NBA.
For examples of defense being big in the NBA look at teams like the Pacers, Heat, Bulls, Grizzlies, and Spurs in recent years as examples of teams that pride themselves on defense that have dominated the league