A volley from Ivan Ramis opened the scoring for the Latics in a 2-1 victory, and Martinez revealed his delight to reporters following the match.
The Spaniard told BBC Sport: "We don't get too many goals from set plays but it was a tremendous finish from Ivan.
"That early goal set the tone of the game and allowed us to control it.
"I really enjoyed the performance. We have been showing flashes of our ability but today we were really good. Our philosophy and way of playing will never change."
The result was Wigan's first win at home this season.