Alright, gave this tactic a run for a lil while and I gotta admit, it's pretty good. Here's the results so far.
Man Utd 3 - 0 Watford
Red Star 3 - 0 Man Utd
Sheff. Utd 1 - 2 Man Utd
Man Utd 4 - 2 Liverpool (actually the tactic proved its worth in this one, we were down 2-1 at HT, came back to win in a dramatic manner)
Tottenham 1 - 1 Man Utd (dominated the entire game, squandered a lot of opportunities, and if it weren't for a costly giveaway, would've been another win)
Legia 0 - 2 Man Utd
Man Utd 2 - 0 Man City
Everton 0 - 4 Man Utd
Man Utd 3 - 0 Fulham
Man Utd 2 - 0 Celtic
Seems like a pretty good tactic overall, home and away. Seems like nowadays you need 2 tactics one for home and one for away, but maybe you've struck gold here.
I'll try it with different teams and report with some more results.