Kari Arnason, Chris Clark and Onismor Bhasera - who also netted an own goal - ended the Dons' three-match winning run at stadium:mk and saw the Pilgrims climb to 13th in npower League One.
Robinson said: "The first one was an unbelievable strike, the second one was possibly the goal of the season in all four leagues and the third one was a very well-worked one where a guy facing away from the goal turns and puts it in the top corner.
"You work on your defence all week and you do the right things, but you've got to hold your hands up when goals go in like that.
"And you've got to give them credit, they were fantastic finishes.
"But for me, I'm extremely disappointed that we didn't create enough chances - if you don't shoot you don't win football matches."