I'm no expert on the 6.2's or 6.5's, but from what I see folks with them in small trucks don't mind them, and folks with them in larger working trucks for the most part aren't impressed.
The way I see if if you already have one and it runs that's great, run it and have fun. But I'd never set out to find and buy one or spend much money fixing one. For sure wouldn't build a truck around one.
Grigg