there not bad, just not as good as he could be.let's go through a list of Pros and Cons to find the answer:
o Has very high attack, paired with Iron Fists, he can be destructive.
o Has decent bulk
o He has no 4x weaknesses
o He has 3 immunities
o He can run the No Guard/Dynamic Punch, which helped fix Machamp
o Has poor speed, way too slow for a sweeper, yet to fast for a Trick Room user
o He can only be a Pysical attacker
o He has 5 weaknesses
o He is in NU for a reason, he get's outclassed
Try Aegislash. he covers all the weaknesses (besides Electric) and can be offensive, or defensive. He has access to King's Shield, Shadow Sneak and Swords Dance. I have put a link to movesets for him below. Hope I helped, and now it's betwene Aegislash and Golurk.