Antony Kay, Gary Roberts and a fine brace from Jordan Rhodes put Lee Clark's men in total control, before Aaron Wilbraham pulled one back for the Dons.
Robinson said: "A second successive 4-1 defeat is clearly not good enough but we need to remember Sheffield Wednesday and Huddersfield are two of the sides that are best equipped to get out of this league.
"We also need to remember how far we have come in a short space of time. Just a few weeks ago we were joint third and not far off an automatic promotion place. I'm not hiding from the fact that there were mistakes.
"The players have got to learn from them and rectify those errors.
"But we also need to remember that our back four have hardly played together because of injuries. So it's been hard for them to learn how to play with each other and we were again missing our two best players."