The Toffees lost for the third time in five matches when Nathan Dyer, Gylfi Sigurdsson and Marvin Emnes netted at the Liberty Stadium to make it 17 goals conceded in seven outings in all competitions this season.
After the disappointing loss, Martinez spoke of his side's subpar performance as he ponders how he can get the Toffees firing again.
"I'm disappointed in the result but not the night. Some individual performances were pleasing," Martinez told the club's official website.
"The scoreline reflects that Swansea were clinical, and we weren't.
"Having made eight changes, I thought we played well. We gained a lot of information about our players.
"You don't want the feeling of losing football games. We need to address everything as a team."
Of summer signing Besic, Martinez added: "I was really pleased with Mo Besic. I thought he did very well."
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