Nope, that's an M47 regardless. Just because by gameplay it's broken doesn't really mean much. Same way I don't expect four people firing them at a mech to take longer to take it down than one person firing it at a mech (which is the case in Peacewalker with coop). Not to mention, none of them are ever blown to pieces, it's always just the AI pod jets off and it's left as is for the most part.
Not to mention, nothing to really say the things he's facing are overall that durable either. It's more likely they're not given the level of technology, real world setting, and their knack for being taken down by a guy with real weapons.
I mean, face it, Big Boss is commonly using real world weaponry. It's goofy to argue his M16 somehow just shoots bullets harder or RPG-7 blows up bigger based on... nothing.
As for Bryan Fury, that's just cherry picking. He's got that one with the tank and the other with the helicopter and is a robot, all of which is consistent. The Paul one's isolated, so you can either say he's playing, it's just plain inconsistent, or that Paul is outrageously strong (given the impact of the hits do make the ground and all chip apart).
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