This is kinda what I'm getting at. With the rings, there really is NO reason that Iron Man should EVER beat Mandarin (without assistance).
I know I'll catch hell for saying this, but not really. Mandarin has at least some good showings, whereas Apocalypse has very few. Even in his own series, AoA, He jobbed to Magneto at the end.
__________________ "Your mother was a venereal disease-ridden prostitute who was raped by the father you never knew and killed herself when she saw what an autistic phaggot you are.
So what about my comments made your ass so sore? Was it me calling you a phaggot? I think not." - Nemebro
I don't think it's so much him not knowing how to tap into the rings power, so much as the Mandarin is ruled by machismo. He likes to prove how badass he is as a warrior, so he mostly just uses the rings to put people off-balance. Like, using a tornado to suck Iron Man down out of the air and go hand-to-hand. Or using illusions to make Iron Man fight the wrong thing so he can get in sucker-punches and sucker-kicks while Iron Man doesn't know who to dodge.
It's like in his mind the rings can't be allowed to steal the limelight away from his personal abilities. Maybe he even sees them as competition to a degree.