Stephen Gleeson's spectacular strike with 21 minutes played put the visitors in the driving seat after Crawley had failed to deal with a corner.
Patrick Bamford added a second in the 59th minute with his 16th goal of the season to secure a fourth straight win for the Dons, while Crawley's Billy Clarke was sent off with six minutes remaining for a professional foul on Lee Hodson.
Robinson, who has been struggling with illness, said: "There's a really good vibe at the moment among the group.
"That's four wins in the last four, all convincing, and not conceding a goal in that period either, so we're doing alright.
"But we're still nowhere near where I want to be and there's a lot more to come.
"I don't think the pitch is suited for a football match. It's a game that two teams have to play and I'm sure if you speak to John Gregory he'll give you an honest reception that this pitch shouldn't be allowed to be played on."
Crawley were reduced to 10 men in the closing stages of the match, but Robinson questioned referee Sebastian Stockbridge's decision, believing he made a number of controversial calls.
He added: "It's one of those unfortunate ones where he slightly overruns the ball, he thinks he's got to go for it and he showed some studs, but he didn't go in high.
"I thought it was a harsh decision and I think the referee made some very, very peculiar decisions, some very interesting ones, and ones from a different rule book."