I am absolutely worthless with a game pad, I think my KDR was .79 on BC2 after a month, since getting my XIM it's up to 1.75 and climbing. I rarely end a round under a 2.5 KDR.
Obviously I would be playing on PC if I could justify spending a mortgage payment to play 1 video game but I can't, that's why I'm using an XIM.