Not to mention it's not the first time a player has gone on vacation during the off week. Emmitt Smith mentioned, during the lead up to the Giants game this year, that one year he and a bunch of the guys went to Vegas for a few days on one of their off weeks for the playoffs, a year they won the superbowl.
And, again, as many have pointed out on here a zillion times if Romo's recievers had made any one of about 4 plays that they didn't make the Cowboys win and no one is talking about Romo's vacation.
To answer your original question...no this is not the most disappointing season in cowboys history for me. I was WAY more disappointed in 94 when the Niners kept us from winning three straight. So it's not the most disappointing to me, anyway.