I feel like Kylo Ren (and AOTC Anakin to a degree as well) has warped the perception somewhat of what an angry SW character has to be though. Anger doesn’t always mean rage. There are moments, even a few in ESB, were you can hear Vader seething, and he does have a few growls as well (one which ironically was removed in the SE). And, as has been pointed out earlier, within the first 10 mins of ANH we get to see (or rather hear) Vader straight up bark orders at his men, not to mention strangle a man he’s interrogating to death before he gets anything out of him. There’s so much more to anger, and acting out anger, than the unhinged shouting of Kylo in the ST.