Missile incoming is a critical and reflex reaction announcement, while counting down time to intercept when most combat takes place in that counting time-frame is a bad example.
As for colors, we had this conversation a few times before, conclusion always comes down to, no, it's bad design, people process colors differently and some people are color blind. Using a few base colors is alright, but using them to convey a large variance is a bad idea.
What's your issue with reading a single number, too much to process?
That sounds more irritating than than reading this thread. What you are describing is essentially music and God knows that always comes down to taste.