Epiphones aren't bad guitars, but saying that theres not that much of a difference is just insane. Whether the difference is worth the amount of money is subjective, because it entirely depends on how much money you have and how much you like playing guitar. Anyone with no money that doesnt play guitar that much will say an epiphone is as good as a gibson, but if you get serious about playing guitar later and don't want to have to trade up again, or want a decent resale price, get the gibson.
My advice, go to a store and play as many guitars as you possibly can, it doesnt have to be a gibson or an epiphone, just play every single guitar there, in every price range, and you should figure out the differences.
Quality control isnt that different from what I have seen, both Gibson and epiphone sell some inconsistent guitars, but the pickups, finish, wood, electronics, tuners, hardware, and the way the different pieces of the guitar fit together is generally much better in gibsons.