Just to prove you wrong, here's my super consistent 1-2 turn Red Nova Dragon out (or at least Red Dragon Archfiend). 
It goes like  
1st turn: Cyber Dragon/ Oracle of the Sun/ SOlar Wind Jammer out first, then any level 3 tuners. (Note the level 3 tuners are stalls, so that I can draw into stuff that I didn't managed to), then go for Red Dragon Archfiend. 
2nd Turn: Go for Deep Sea Diva and summon another diva to double tune into Red Nova. 
Assuming Red Dragon survives one turn. 
And Diva is going to be at 1 coming Sept. 
But you know, it's still pretty good. 
maybe