@givemersspls
Yes, you're definitely right, but there's a tendency among people who know a bit more about swords to over-compensate and claim that katanas were rubbish, when they really weren't. Basically replacing one myth with another. They were okay swords, not bad, not super good either.
And yes, the quality of the material was very bad, which is precisely the reason they folded it so many times, to spread out the impurities along the whole blade, so that it doesn't affect the blade as much in any one place.