Ok, I've played both sides of the argument. As devil's advocate to put down people who say there is no historical precedent for HO attacks, and as a player and a person who believes that others who see the HO as a tactic they can rely on are delusional.
Here's a historical precedent for you. Not an angles shot, not deflection shooting of any kind, just pure, unadulterated, flat out HOing. And the reason why its a noob tactic that most pilots (and sim pilots) who get some ACM knowledge and experience under their belts will avoid like the plague. (The guy also just happens to be from my hometown).
Lt. Col. Herschel "Herky" Green
Unit(s):
317th FS
325th FG
"Checkertail Clan"
15th USAAF
MTO
Top Ace of the 325th FG. At the time Green left combat flying for HQ XV, he was the leading "Ace" in the MTO. Green started out with the number "13" assigned to his P-40F - In his first "scrap" with enemy fighters on May 19, 1943, Green scored his first victory in a head-on pass versus a Bf 109 that put nearly as many holes in his own aircraft. Green's unlucky "#13" was ultimately declared unrepairable and hauled away as junk and he switched to lucky "#11". 3 Air Victories in P-40's, 10 Air in P-47's, 5 Air in P-51's.
Anecdotal references I have read elsewhere but cant bring up right now indicate that this first "victory" of his forever after marked the way he flew, instilling an element of caution into what was otherwise a very headstrong and "damn the odds" type of man.