United are a mid-table team, made even worse by trying to play a formation that doesn't suit their personnel one bit, but regardless it was a dominant performance before Forster brough them back in .
Playing a physically imposing duo of Sarr-Bissouma against their weak midfield featuring Eriksen and Fernandes worked out quite well. Combine that with us disrupting their build-up from the back, thanks to Solanke/Spence/Sarr/Bissouma in particular, and they never really posed a threat. Without us shooting ourselves in the foot in an extreme fashion, this'd have been a totally one-sided scoreline.
We didn't create enough to justify scoring 4, but we shouldn't really have conceded any either.