It's mostly a preference, I guess. The tank has health, the assassin has damage, the commando has ammo, a lot of ammo (and explosives). The medic is mostly balanced on stats.
Every other class is useless except for the one you use, I suppose.
I didn't think that the Commando could be used for anything properly besides the Norris, Chuck mission. Proven wrong I guess.
I agree with BRAAINZz the Commando is pretty useless even on the "Norris , Chuck" Mission he is still rather useless.
Do you even think about how to use it well ?
Which aspect he's good at ?
Skills and Killstreaks combination ?
Suitable Main and Secondary weapon ?
Your skills ?
I see Commando is really good !