The way I view the... it's called the Nasuverse? Well, anyway, the way I view it is that it absolutely
reeks of too many cooks spoiling the broth. It makes perfect sense if you view Fate/Stay Night, Fate/Zero, or any one of the non-fate series in isolation. This is because they have their own contained vision created by their artist.
However, if you start getting into the other Fate series (which sorta read more like fan-fictions of the original) or trying to start thinking about how the stories in universe fit together, it starts breaking your brain. This is because you start to get conflicting visions as the artists who made the respective stories just didn't line up in their opinion of how this should all go.
(Also, I would like to note that Fate/Zero was not written by the same person or people who wrote the original. It was written by a master writer by the name of Gen Urobuchi. The man is clearly extremely good at his craft. If you didn't get that from his
impressive portfolio which speaks for itself, then you can easily get it just by reading / watching the anime adaptation of Fate/Zero and comparing it to the original Fate/Stay Night and noting how well the two fit together lore wise without any of the horrible contradictions you see in the rest of the Fate portion of the Nasuverse where the artists just basically do whatever they want without really caring about the original lore)
BTW: This is the same sort of issues the Kingdom Hearts franchise is guilty of.
EDIT: Also, can we please erase the Disney StarWars Trillogy and get Gen Urobuchi to do the new version? We really need someone who shows the kind of care and honor to the original that this man does. It's exactly what Disney was missing.