I stumbled upon this site: http://www.bts.gov/programs/airline_...me_statistics/

So as all curious UA flier would, I put up 2007 Mesa @ ORD: 6.45% flight canceled, vs 4.45% overall. 31.22% flight late, vs 29.18% overall.

As for UA, 3.21% canceled and 30.11% late. Mesa appears to be 2x the cancellation rate of UA, although just a bit higher than average.

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Mesa @ IAD, 2007: 4.45% canceled, vs 3.21% overall. 27.92% late, vs 22.49% overall.

As for UA, 2.22% canceled and 21.10% late. I can see Mesa appearing significantly worse. All in all, this may be a case of perception. A caveat is that this is stats for the whole year, so during good times no flights are canceled for either UA or Mesa, thus data from normal operations significantly dilute the "bad data" from irrops. During irrops, it may very well be 5 Mesa canceled for every UA.