I think the distinction here is less between "noble" and "evil" wrath and more between "controlled" and "feral" wrath. There are plenty of evil characters who do "noble wrath" expressions, and even a few heroes who do the opposite. What it comes down to in the end is how their specific brand of anger is shaped by their personality.
"Controlled" wrath is done by just barely tapping into the range of human anger expression. You should know the basic aspects by now: eyebrows pulled in, frowny face, etc. You just do those, but gently:

Basically, it should be clear that the character is angry, but that's about it. The anger is controlled; it's not about to take them over and make them run wild. It's just there.
"Feral" wrath is done by going to the extremes of human anger expression, including more 'animal' expressions of anger/ferocity (bared teeth, 'clawed' fingers, hair raised). You'll want to exaggerate the facial features more:

Basically, now you should give the impression that this character is not only angry, but about to act on that anger violently (even if they aren't).
...I'm sorry my doodles are so simplistic; I'm using my pen-mouse right now. ^^; But I hope I've given a good basic explanation of what's going on.