Honestly, the only was I can say that anyone can really judge the sounds is either one, they are just absolutely horrid not even close to original or two if your basing it on the real life weapon, in which case unless your a gun nut like me and former weapon tech (USN) you really can't say too much about em. In my opinion when it comes to a game, weapons are weapons. If it goes "boom" I can't really argue with it unless, like I said, your trying to match it to the real thing.
I honestly can say, they should sound like the original, but the original changes sound to its given environment, so they'd have to make quite a few sounds, but they're going more towards real life and game fiction. I personally have Bashe's original N64 sound pack for my guns, although I would like to add to it.