Commando Archive

I have been wanting a change lately and considering changing profession.

Ive been considering either a TKA / doc / ch sort of combo or a Commando / doc / ch combo.

My question i guess is how powerful is a commando with just flame 4? can he tear through missions like so many commando's ive seen can?

I don't pvp, so pve is my only concern.

What would be the most effective combo? I think im keeping 3 2 0 0 ch to use a graul mauler. and at least 0 0 4 0 to use buffs in doc line.

thanks