So, I think its about time I nominated Machamp, innit? I'd probably place him around the same rank as Conkeldurr, give or take. Check out this Replay.
http://replay.pokemonshowdown.com/battlespotsingles-368987615 waifu sweep
This battle was a captivating Machamp sweep, but it was also a mildly fiery debate starter. After posting it on PS chat, a few members, and even a couple staff commented on how sub-optimal Guts Machamp is, because it would be outclassed by Conkeldurr. Reasons were given, such as Conkeldurr's higher HP, Attack, Defense, and his access to solid STAB moves in Drain Punch and Mach Punch. But the thing is, Conkeldurr statistically has Guts far more often than Machamp has Guts. And since many people assume any given Machamp simply has No Guard, they go about burning it, paralyzing it, trying to wall it with somewhat passive mons like Cress, Ferro, and Sabl, offering Machamp plenty of time to hit the gym.
If Machamp has these strong advantages, as well as some raw stat benefits against Conkeldurr, in Sp. Atk, Sp. Def, and Speed, then that's certainly something to give Machamp viability. Dynamic Punch niche is still always there if you plan on maximizing luck factors with things like Klefki and Thundurus!