-1 for the Thunderbird/Cactus merge (mountains do that) and the Greenway Parkway/Bell Road area.
Also, -1 for changing street names for no reason like Olive/Dunlap
Finally, -1 for the cities that turned the numbered streets east/west instead of the required north/south (you know which cities I'm talking about)
Now that I'm done bad mouthing the actually very good grid of Phoenix and it's suburbs, I think it's fun to look at development over time. You can see the change in street patterns based on when they built. The oldest tend to have a nice grid, then it became more of a center collector with maybe a grid running of it or some kind of broken grid, then there was that curvilinear phase where a straight street could not be found. I haven't seen where the latest trend is going, but I can see larger master planned places with enclaves of developers isolated by collecter streets. Still no one bringing back the old grid system.
In my last job I argued for a 1/2 mile collector grid to supplement the 1 mile arterial grid. I always said it could curve or do whatever as long as all the dots connected to allow things like kids on bikes to ride on a lower traffic street and get to where they wanted to go. Then I couldn't get engineers to understand that a collector does not need to be five lanes and 200' wide with no sidewalks. Damn traffic engineers!