I'd rather prefer arcade vs. realistic instead of fun vs. realistic, since "fun" would be no fun for some.

Or scalable realism.

Maybe the term arcade has become a bit of a derogatory label, but beginnning to rephrase arcade into something else is going to be hard without sounding very PC'ish:

"Gameplay enhanced realism"
"Realism subjected to enhanced gameplay"

With arcade and realism we know exactly what is meant.