Oh great, you are now vague posting about a system that does it well.
It's still not a good option in character or as a rule, once fighting starts.
I am fine with held actions as a "hey, don't get into my range, or I will stab you, but otherwise I will set here, because I will use other character features to deny this area to my enemies.", but that's something where you are giving characters insentive to not break formation, and giving them an option for direct attacks that doesn't sac their whole turn's damage pontiental.
4e D&D's defender role monster/class camping in a high value area and sitting on a held action to poke does that, while still using the OA framework to possibly double punish a character changing in OR still having some area denial afterwards
Otherwise, monsters have to be actively dumb to not just walk over to the squishy support class and disable them.