The stench of disappointment and frustration oozed from the Flyers’ dressing room as players took turns spinning what went wrong Tuesday night at Madison Square Garden when a third-period tie turned into a 4-2 loss to the New York Rangers. Claude Giroux, the captain, stood there again telling reporters and cameramen how important it is to play a full 60 minutes of hockey on an evening in which a Rangers goal in the final minute of the first period wiped out the Flyers’ only lead. Scott Hartnell, an assistant captain, and Jakub Voracek, the Flyers’ leading scorer, talked in soft voices about mistakes that led to Rangers goals as well as their own missed opportunities. And Ilya Bryzgalov, in a simple but refreshingly honest assessment of a Flyers’ first-half season that now is over, blurted out “we’re not good” witha deer-in-the-headlights look on his face. The Flyers had done a whole lot of positive spinning after beating Ottawa at home last Saturday to finally get to .500 after blowing six previous chances to even their record. It was more of the same following Monday’s practice and Tuesday’s morning skate.