I still think it is a good truck, but it really isn't great at any one thing. It's not the fastest, most reliable, fuel efficient, comfortable, and etc....
I thought about one, but the Toyota driveline really shines. As well, the Titan suffered a lot of first model year blunders which were really bad for about 3 years. (burning up rear ends, brakes, interior problems, etc).
The Nissan Titan was also never a volume seller. I think they try for 5% market share....although that might change when they introduce their diesel next year.