I know many veterans of the sandbox, that have no particular love for for the M-16.
True there are some who want something other then the M16/M4, I read that poll. Have it somewhere.
20% of the soldiers in Iraq want something else. HOWEVER 80% say they are satisified with the M16/M4.
You cant please everyone, so I would side with the 80% of the end user.
To me it is Vietnam, or SE Asia. But like in guns we all have opinions. Based on my experience using the M16 in combat, and LE, and compitition, I have no complaints.