We sell them like crazy... and promote them just the same.
Lets see... one run away engine... one failed oil cooler that ended up getting an engine... probably close to 10 A/C compressors, countless HP oil leaks at the d-rings... 2 hydro-boost leaks (on to the drivers feet)... a few injectors, 0 EGR valves or coolers, lots of door speakers, one rear hub seal... and a tonne of retail maintenance.
I personally think they are excellent trucks, they manouver great, a little rough in the ride... but, all in all... they only thing they are missing, is a V8 if you ask me.