I wondered about the 1st half too, if Mata had scored just before HT, they'd have been saying this is a rout, Liverpool haven't created anything apart from a header at a corner. Utd have carved open LFC several times.
But, as for the respective styles of football, theirs is a lot easier on the eye than ours. It leaves them open to direct (quick / long ball) counter attacking though. This is where the space is.
2nd half - I'm not so sure, but 2-0 is a decent lead while it stays at 2-0. Scoreboard control & scoreboard pressure, you could even go to 3-0 from a set piece, a penalty, a 2 man attack or whatever. Why offer up the counter-attack to the losing side? Maybe this is modern footy at the top level. Utd turned down some attacking opportunities simply to retain possession.
Defences have a tendency to sit very deep these days - if you can get out & offer a threat it's fine but not so good for your team if that isn't happening. Fellaini sub was effective & well-timed yesterday.