Alright, so I strongly think that Machamp deserves an OU Analysis and for a variety of reasons. First off, Machamp can easily stop common leads like Ferrothorn, Excadrill, Heatran, Landorus, Mamoswine, and Tyranitar from setting up stealth rocks by confusing them with Dynamic Punch, then wrecking with a coverage move. I usually put enough evs in speed to out-speed Heatran at its base speed, then invest the rest in hp and atk. Machamp won't be able to out-speed Mamoswine, Excadrill, and Landorus, but can easily OHKO Mamoswine and Excadrill while being able to confuse Landorus and finishing it off with ice punch. However, this is not Machamp's only niche in OU. He can abuse his other ability, Guts, to inflict heavy damage on a lot of Pokemon. He may seem out-classed by Conkeldurr in this, but Conkeldurr can't play mind games with his potential ability. For example, and I know this from experience, I led with Machamp and my opponent led with Rotom-W. He knew that Machamp has Guts, so Rotom-W switched out and his switch in took a dynamic Punch to the face (he switch into Talonflame). The Talonflame then hurt itself in confusion and Machamp easily finished it off with Thunderpunch. Other than Machamp's No-Guard niche over Conkeldurr, Machamp has one other niche: Encore. It doesn't sound very impressive at first, but think about it. Machamp is generally slower than most pokemon, even leads, so being able to make the opposing pokemon encore stealth rocks or sticky web ( I rarely see spikes used due to the defog buff) will force a switch at the risk of being KO'd, but most pokemon don't appreciate a Dynamic Punch to the face. There is only one other pokemon who can abuse Dynamic Punch and No-Guard and that is Golurk. Why choose Machamp over Golurk? Well, for a variety of reasons. Golurk misses out on the fighting type stab of Dynamic Punch and Machamp has superior attack and bulk while they both stand at the same base speed. Machamp also has 2 things that Golurk would kill to have: A priority move and a better defensive typing. Golurk does have access to stealth rocks, which definitely gives it a niche over Machamp. Machamp's greater power with Dynamic Punch is very important to point out, as Machamp 2HKO's Max hp max def Ferrothorn while Golurk only manages to 3HKO, and with many Ferrothorn's carrying a Rocky Helmet, Golurk can be wiped out by the combined Rocky Helmet, Iron Barbs, and Power Whip damage. Machamp's better typing is also a very important detail to point out as aside from a few uncommon leads, Machamp will only be taking neutral damage at most from the most common leads in the current OU Metagame (aside from Skarmory) while Golurk has to worry about Ferrothorn, Breloom, Tyranitar, and Mamoswine, just to name off a few. Overall, Machamp's niche as a Dynamic Puncher is almost unparalleled by any pokemon. I really thought this through and I hope it can be considered.
EDIT: The following replay represents both Machamp's raw power and bulk:
http://replay.pokemonshowdown.com/oususpecttest-106680308