To summarize, AFC is slow. Tracking is poor and 3 fps isn't fast enough (and also slows down during AFC).
I agree with those statements but will offer up the following:
-AFC is faster than I am
-AF tracking is actually pretty good unless the subject is running at you head on and anything that moves faster than a kid running makes the outcome uncertain.
-3 fps isn't all that bad....at least not for day-to-day action.
Furthermore, you'll notice that the only blur in the photo below comes from motion - not focus (which is on his eyes) and this was shot in AFC in continuous drive with obviously less than stellar light:
(Notice, he's coming strait at me)
In spite of your critique, the K10D does function in that capacity. Even I concede that it's not on the same level as other camera models from other makers, but it'll get the job done.