I think it's wrong to just blame the defending though. Had Greenwood passed to Rashford on that first chance he had, Rashford was a better option and may well have tucked that away, he chose to shoot. It would have been a different game then. Same goes for Rashford on a number of occasions. Games are lost at one end and won at the other. We failed at both.
At one point our chance creation was about on par with RBL, the only difference being they put theirs away. I'm not saying our defence didn't have a shocker, just that they weren't alone. Greenwood and Rashford could both have been more aware of other players in better positions or less selfish, take your pick.
For what it's worth, I'm not slating Greenwood, I actually think he was one of our best performers last night just that everyone is rinsing the defence and ignoring the fact that both Greenwood and Rashford we pretty wasteful at times. You have to take your chances at this level, you don't get many.