I actually did the opposite with my dd. She too was fighting it, in fact, she "got" the routine so well that she would start crying and protesting right before I would start swaddling her. However, keeping Tracy's advice that spirited ones benefit from it, I kept with it and came up with newer and more clever methods of keeping her swaddled. So after a few weeks of fighting it, she really dug being swaddled and in fact, she would calm down instantly when swaddled and fall asleep very easily (and most importantly, stay asleep). Because she was sleeping 12 hour stretches with the snug swaddle, I was reluctant to mess with it. She is 26 weeks old now and we just recently weaned her off. But honestly, it takes her a lot longer for her to calm down now - I do miss the days of the swaddle.
PM me if you'd like me to share with you my many houdini-proof swaddling methods.