The centre print would be the #1 killer of S1 humans.
The center printed text for teammates is too large and badly placed on the default HUD.
The crosshair and teammate info are too close together like this:
|
- - <- crosshair
|
<- space is about 3/4 inch on my screen
TEAMMATE [HP] <- text is too large
When you see a teammate attacked by drecthes, the HUD text showing their name and health often covers up the dretch on screen, making it difficult to aim at them. I'd suggest making the font smaller AND moving the info much farther down or even way up to appear above people's heads, leaving the floor around their feet more visible.
Additionally, having game messages mixed with chats are bad, because it makes it difficult to separate useful game info from mostly useless chats. I'd suggest moving chats (and team chats) to the lower left on screen, and keeping the game events in the top left.