That's the consensus amongst the crowd that like to drive with their foot in the oil pan all the time. For those that simply like to "cruise", those gear sets are about 2-ratio's too high.
It depends on what your setup is and personal preference. Me? With an AOD and N/A, 3.08's were too high a gear. The 3.73's woke the car up. Now if I was doing all highway driving, sure I'd drop it down a litte.