Easier than canceling your subscription would be just to skip the columnists you don't like. Are you telling me that you don't enjoy Gail Collins, or Frank Rich, or even Paul Krugman?
The Times is one of the few papers that still employs decent columnists, instead of local cheerleaders. You should reward it for offering a variety of writing styles -- even the ones you hate -- rather than sticking with happy-face essays praising hometown "heroes" or the latest Girl Scout Cookie Drive.
Unfortunately, you are right. I blow my top about once a month, usually regarding one of the three individuals mentioned here or an op-ed by a Republican or Democrat hack.
In the end, though, the Times is still a much better paper than most.