Ferguson admitted United were "competent but no more" as they brushed aside Wigan 2-0, with the visitors playing for the last half-hour with nine men on the pitch.
Headed goals by Patrice Evra, his first since April 2007, and substitute Javier 'Chicharito' Hernandez secured the points to leave Ferguson satisfied - especially with Chelsea and Arsenal suffering losses.
Ferguson said: "It has been a good day for us, no question of that.
"If you had said at the start of the day would you take being joint top of the league I would have said 'yes'.
"We know that come the second half of the season we will definitely get better and now we are joint top with Chelsea."