I think Weapon Degridation is possibly the best thing that Bethesda introduced to the series.
Why exactly?
The stuff you're likely to find post apocalypse is likely to be in a poor state.
I agree, but IMO the earlier games had it right.. A PC that can fix the esoteric internals of just about anything and structurally repair combat armor to be equal (or better than new ~like the factory did it), runs afoul of the same principles that Oblivion did when the PC could master any and every guild (at the same time).
Is it plausible (or even desirable mechanics) that the player character be the best man (or woman) at everything in the game? To not have any acknowledged experts? (cranky old men with a workshop full of a lifetime's collecting of specialized tools? No savants in their basemant? ), C'mon...
It would be fine with me if Bethesda implemented repair after the way Arx Fatalis did it, where the PC's skill can be used to affect repairs, but they are not specialist experts and their (amateur) work may improve the condition, but also degrades the maximum condition of the item (
each time they repair it!); reducing the maximum durability, or perhaps damage resistance ~certainly resale price... What sane merchant would buy an assault rifle repaired with duct tape?). ** Also [IMO] it would be good if the PC's repair work added weight to the item.
** Would this not also be a both plausible and an excellent 'gold sink'? High cost for high-end work by a professional, and improvements not available to the PC's home-brew jury-rigging.
IMO, if the PC is going to be an expert gunsmith, they should have to center their character around it all but exclusively... but that does not make for a well rounded adventurer ~hence, I don't see the point of making it an option as they have in FO3 (by making it relatively easy to attain without serious cost to the rest of the character's development).