Infernape is still good, but it gained a considerable amount of checks since last gen and with the shift toward bulky offense, it has more difficulty killing things with certainty should it find itself without a boost. Tying with Terrakion and Virizion does it no favors, and with Latios, Latias, Starmie, and the twins running rampant it has issues there, too.
It can definitely work with the proper support, that I'm not arguing with, but being so easily revenged and having slight movepool issues make it a tad shaky. And as previously mentioned, it is an additional fire-type when paired with ninetales that doesn't offer the sheer power of Darmanitan, the resistances of heatran, or the steamrolling effect of Volcarona. I prefer this set:
Infernape@Life Orb
Naive; 192 Atk / 64 SpA / 252 Spe
U-Turn
Overheat
Stone Edge
Close Combat
I can't remember what the SpA EVs were for at the moment, but this Infernape is better suited to the meta as it is right now, IMO. U-Turn is as good as ever, while Stone Edge compliments Close Combat's great coverage and power. Overheat gives it something to fry Skarm and Jirachi with and a super powerful attack once Blaze is active.