I've seen some extreme pro Zenyatta things that make me dizzy
. I disagree with most of it. I also have no problem with people that think there are major questions about her ability on dirt or even the quality of horses in CA on synthetic.
On occasion though, people say silly things like "she's slow".
In response to that it's possible to supply an endless amount of objective data on average paces, average winning times, the thoughts of multiple figure makers, the paces of her races, and a little common sense to more or less demonstrate that synthetic figures don't translate well to dirt. That means you have to go beyond speed figures to discuss her and the quality of performances in general across surfaces.
Some people do an admirable job of that even when I disagree with some of what they have to say.
Some people insist on saying "she's slow" even after presenting all the data etc.... IMHO that is a preposterous point of view because we don't know how fast she would run with a legitimate pace if she likes dirt as much. But we do know that if she can run a 108 Beyer on synthetic with the typical slower synthetic pace, if she likes dirt she might be 5 or more points faster on dirt and that's damn fast for a mare.