Matter of opinion. I think it could have been better. All of it was built from F3 and rehashed... there was just lots more of it.
There was not a lot more of what was from Fallout 3, no, because all Fallout 3 let you do was make weapons, NV added ammo, more weapons, armor, misc, poisons, chems, and all kinds of other stuff.
It was actually less of what Fallout 3 had, sense including DLCs there are only about 7 craftable weapons.......but there were loads of things that weren't even in Fallout 3.