I've always heard bad things like that about Remington's rimfire stuff. I'm not all that wild about their centerfire stuff either to be honest. Maybe their premium stuff is alright, but the budget Rem/UMC is my least favorite target ammo.
Only Remington rimfire I've ever had is some .22 subsonic, and it has worked fine, though it's just barely subsonic and depending on ambient temperature or barrel length they can go supersonic which sort of defeats the purpose.