Yep, that was it. He's playing - not solely based on today, but this season as a whole - some of the worst football I've ever seen from a United-striker/attacker.
He seems so mind-numbingly unsynchronized with players he's played with for 3-to-5 years. That's not only aggravating - that's actually impressive how you can sink that low in quality and football IQ.
Rashford definitely has been up and down this season and when he's down, he's just as useless as Martial, with no grit or fight in him - but with Martial, he's never up anymore. He's not doing anything, orchestrating anything, solving anything. He's just there. A stool in the corner which absence you'd never notice.
He is not good enough. He genuinely wouldn't start ahead of Vardy at Leicester, Jimenez at Wolves, Lacazette at Arsenal, Watkins at Villa, nevermind teams like Liverpool, Spurs, City, Chelsea etc. If that's the case, then you shouldn't be near the starting eleven at United.