I think, using this term is just as daft as Rangnites. Is this the reason, why you seem to be so driven to make sure RR gets out of any positive lights? Because it feels a bit awkward, if this is some sort of extension of the Ole in or out argument, thats fine, just say it, because then the fire here will burn down.
Btw: you called him "crap" and said he "fooled the club" - I am sure you can understand that this isn't really indicating "wouldn't say he's incompetent". For a common grounds sake: he probably isn't something special anymore. And he surely isn't a miracle worker. And yes, some people allowed their enthusiasm to hype him up to a level he'd never be able to fulfill. But at the end of the day, he has a trackrecord of being a competent coach. And he has a trackrecord of creating productive modern football environments. United could have benefitted from his knowledge.