For Norwich, however, it was not the result they needed as they battle relegation. While they are still sitting just outside the drop zone, their final matches against Chelsea and Arsenal make them favourites to go down.
The Manchester club's official Twitter feed noted the arrival of the 40-year-old United legend for his first game in charge:
Meanwhile Squawka noted that Giggs was not the only veteran sitting on the United bench, as Phil Neville, Nicky Butt and Paul Scholes were also there as his assistants.
Cricket writer Elizabeth Ammon was overwhelmed by the romance of it all:
BBC Sporf were less than subtle about the occasion:
Football Funnys noted that Giggs had learnt a lot from Alex Ferguson, including his legendary time-keeping:
While PaddyPower made a different comparison:
Bundesliga writer Cristian Nyari felt that the attention on Giggs could perhaps take away from the football, somewhat giving his own suggestion for the TV people:
The Giggs effect was not immediately obvious in United's play, as they laboured in the first half, playing in a similarly ineffective way as in their loss to Everton last week.
However, they were given a chance to go one goal ahead when Danny Welbeck was hauled down in the area, and Rooney duly delivered from the spot, as reported by the Premier League:
The Telegraph's Henry Winter noted Giggs' reaction to the first goal of his managerial reign:
The second half saw a big improvement from United, and Rooney doubled their lead with a great strike in the 48th minute, per ESPN FC:
Mata then grabbed himself a double after being substituted for Welbeck on the hour, the second a stooping header as shown by Sky Sports:
PaddyPower felt that Javier Hernandez may have been frustrated not to have gotten on the scoresheet:
While it was a big win for Giggs' first game in charge, Rob Harris of the Associated Press pointed out that Moyes' recent results had not been as bad as many have been making out:
Harris also reported Rooney's post-match thoughts:
A good win for United but yet another setback for Norwich who look destined to be playing in the Championship next term.