I've shot tons of steel cased Tula in .45 ACP without any problems.
I only recently purchased a 5.56mm rifle. A Golani (Galil clone). Again, no problems with steel cased.
I've never had a round fail to fire, extract, or any other issue. IT IS DIRTY!!! I don't mind cleaning my firearms and it does take a some extra elbow grease getting things to where I like them but I don't mind the extra cleaning as opposed to the extra cost.
That said, not all semiautos are built the same and if your firearm is having problems with the ammo, it may not be that the ammo is junk, it may just be ill-suited for your particular gun. I know when I find a brand of ammo that my semiauto .22's don't seem to like (the mother of all finicky autoloaders) I just try to avoid it. Fortunately, I don't have ammo picky weapons but I do notice that seem brands have more issues than others and it is rarely the same brand between weapons.
For the OP, if I was seeing any problems with a particular brand through my rifle, damn right I'd quit using it. Again though, doesn't mean Tula is junk as I've never had a single problem other than the maintenance issue.
"For every problem there is always a solution that is simple, obvious, and wrong." - Mark Twain