I certainly have to agree with the point you made about different standalone players displaying differing amounts of pixelation, considering that -- of the three units I've owned -- none of those displayed exactly the same qaulity of image among one another. In fact, my Phillips standalone pixelates EVERYTHING (and, to add insult to injury, chops the ends off of music tracks on CDs). So, yeah, it's possible that PCDANO's problem resides in the player that he uses. Good call!
I've no arguement, either, with the idea of different media yeilding different results -- bad media's bad media! Choppy playback, incomplete playback, strange navigational problems... name it. This effect could even be seen on good media with a bad burning program (buffer underrun, which is known to cause blank spaces in certain CDs and cause playback problems with DVDs) -- as you pointed out. If this was the problem, then sure: Recording at a slower speed just may give enough of an edge to overcome it, unless the recorder simply can't make good media out of bad. But PCDANNO didn't mention such problems.
Since PCDANNO was asking about reducing artifacts, I made the assumption (we all know the saying behind making assumptions!) that he was trying to reduce the pixellation of a DVD2ONE-encoded stream by burning that same stream at a lower speed. Which, of course, is a no-go: Garbage in, garbage out -- and some movies re-compress better than others.
So I guess what I'm saying is... what was I saying? I suppose it's one of those things, when trying to come up with a precise answer to a general question!
Were you noticing pixellation on your PC, or just your television?