Man. Drago in Creed is really really goddamn hard to beat. The fucker just won't stay down. He gets up from a 9 count and wins almost every time. He only has to knock you down 3-4 times to win with a few clean punches whilst you have to continuously wail on him. 
Rocky is really easy in comparison because he's quite short. So you can hook his head easy since he leaves it open a ton. Drago is huge and he just ignores body blows.
You can't block too long either because he staggers you and he can just punch straight through a counter blow. 
Damn. I want to buy Thrill of the fight now but I got to wait until I get paid. This will do for now. Its still a fun arcadey boxing game.