Ok did not see this soooo yeah.
(Intro)
Infernape, is put simply, outclassed in terms of stats. What once were legendary mixed offensive stats in DW OU are now, well, average. Hope is not lost for this blazing ape: there is one thing infernape has that nothing in OU has: Close Combat, U-Turn, and mixed coverage all together with a nice speed stat. This makes Infernape a deadly cleaner, when threats like Dragonite (when Infernape has no Stone Edge or HP Ice), Mega Charizard Y (Infernape without Stone Edge), Garchomp (Without HP Ice), Landorus-T(without HP Ice) (Overheat will never KO), Full HP Hippowdon, Full HP Mandibuzz, etc. and checks like Alakazam, Espeon, and Latios are removed, Infernape has the ability to just rip through weakened 'mons with its coverage. When normal special cleaners are walled by a late-game Blissey/Chansey, Infernape can just tear open pink blobs with Close Combat and dandy fairies not with Huge Power are mutilated with Gunk Shot (yeah, it actually learns it <3). And while a physical cleaner would stand walled against Hippowdon and Mandibuzz, when both mons are at risk when at below 50% (Overheat Cleans em). Even better, Infernape resists Bulllet Punch, Sucker Punch, AND Ice Shard. Infernape even learns moves like Encore, Endeavor, Fake Out, Stealth Rock, Taunt, Toxic, WoW so it can potentially run a half support set/lead. Even then, Infernape has other Attacking Options like Shadow Claw, Earthquake, Thunder Punch (+Iron Fist), Mach Punch & Vacuum Wave, Stone Edge, Gunk Shot/Poison Jab, and Grass Knot, all which are effective options to cover threats your team needs to cover. All in all, this monkey is not to be underestimated and is still very much viable in the intense OU environment, but, to succeed, must be played smartly.
(intro end)
Yeah basically states why Infernape is not "bad". It just isn't super bad because it can't just SD and kill everything: You need thinking, prediction, and the guts to use Infernape. Very much like how monkeys/humans are like: I wonder?