Any guideline about severity of bugs?

[Dukc]

Apart from regressions being considered the worst bugs, I don't 
know of any guideline on evaluating a severity of a bug I'm 
reporting. I feel this is a problem. Because everyone has a 
different perception of what consitutes, for example, a "major" 
bug, this means that two bug reports about the same issue may 
differ by multiple severity levels.

For example, my personal rule has long been "if the compiler 
crashes from using a vanilla, or soon-vanilla (DIP1000) language 
feature, it's automatically critical". But some report those 
issues [as 
"normal"](https://issues.dlang.org/show_bug.cgi?id=19932). I 
don't know which is right, and I don't think anyone else knows 
either.

This means that those who are bold with assigning severity levels 
get more attenton than those who downplay their bugs severity for 
fear of dramamongering accusations, or something. Also it's hard 
to override the severity of bug reports of others even when I 
feel it's wrong, when there is no guideline to say which 
interpretation is right.

Are there any guidelines that I'm not aware of? If not, I think 
they should be laid down. It does not need to be anything 
complex, just several rules and examples to get us started.