PvE Lunge2 (I'd seriously take Master brawler for all melee classes except TK) Warcry2 when down health hit2 health hit1 (these still stack) Then I just pummel away. On multiples I will switch targets and stick the same routine on the others then CoB. Intimidate2 when the 20secs from Warcry (assuming it stuck) is almost up. If it's a single I may use a couple of Hit3's while down.
PvP Get a good range. About 10mtrs against a TK or toe2toe against another melee. Dizzy Lunge2 Healthhit2 blind Warcry2 finish. Of course that's only the plan of action never and you're opponent will not want to follow your plan.
On Running shooters Lunge1 or 2 will hit at about 22mtrs range.
I have never used CoB in a duel. I haven't taken sides for PvP so I can't comment on that. The fights rarely last long enough to need it.