I've linked this in a few other tickets in the past but I'll do a full comprehensive one here:

As of the last patch this has gotten 10 times worse than it was prior, when I was at Morton last week I had all my textures except the buildings, and the vest that players were wearing completely go away. I could see players through a BTR which didn't render, I could see through players except their gear on their bodies.

This occurred in the past when a server was so overloaded that the server had a hard time keeping up with what was going on. It seems to be server related, since the majority of the time it happen is when the server FPS drops below 20, and then it never recovers on loading up the textures.

I have reported this in this ticket about buildings:
T169726

and in this one as well
T167538

Those were well prior to 1.0 with no updates ever being done on them.

This issue is bad enough that it fully affects gameplay, I was talking with Xbox players and other PC players and it happens to them as well.