In the beginning, I think you are right. However, because Nissan never really pushed the Titan in an ad blitz, etc, etc, sales fell. As sales fell, no other manufacturer HAD to compare themselves to the Titan.
As for reliability, the Titan has had the same teething problems as every other new model. Look at Tundra, Ford, Dodge and Chevy. They all overcame their problems, but with hardly any advertising, the Titan was doomed through word of mouth. I lay the failure of the Titan squarely on the shoulders of Nissan.
As you have heard me state time and again, I own 2 Titans, an 05 and an 08. They both are as reliable as sunrise. But except for here,nobody knows.........