Rasterization problem in version 11.3.0 that was not in 8.0.1

What happens if you go to Edit | Preferences | Appearance | Graphics and crank the slider for "Antialiasing Quality" up to highest quality?

Also, you might want to consider trying the antialias functions given here and here. Those posts might contain additional helpful information about the topic.

When you do this, it's easy to get something like this