The machine doesn't make noises or change colors when it's being used, so it may not have been obvious when it was important. Here's some uses of the exoskeleton off the top of my head.
Tearing off the robots head during the first hijack. Tearing the car door open when it gets flipped on him. Defending himself against Kruger's sword attacks. Being able to fight Kruger at Elysium when they both had exoskeletons on. Being able to function with all the radioactive poisoning. The hand to hand battle in the armory when he tossed the guy across the room. I think the suits computer also allowed for the data transfer which was the key to overthrowing Elysium.
So the suit might not make him fly or fire rockets but it was still very critical to him succeeding in his mission.
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