I dunno, assassin without stealth is pretty pointless
Also Firestorm for the Elementalist and long shot for the archer are pretty vital too, you can play without it, but you can also play reaver without ravage, it will be gimping you, but it's always possible.
That's kinda my point, most people talk about the rampage bug as if the class isn't even viable in threatening, let alone perilous. so is the class merely gimped by not having rampage or is it actually broken?
I don't have a great deal of perilous experience, to me it suffers from the same problems as high difficulties in me3mp(enemy stats stupidly overinflated turning each match into a slog). but the few times i've ventured in(granted, on an assassin) it seemed there was nothing that rampage's healing/attack boost would really save you from. If you get targeted by 2 or more archer's without guard or barrier, you're dead. nothing about rampage protects you from that. it doesn't apply enough damage to make a significant dent in your killspeed, particularly given it's healing prevent bonus damage on dragon rage, and it doesn't heal enough for the massive shots you're taking with each enemy attack
The op's comment was basically " i feel way too easily killed on perilous" responses were "its because rampage bug" my argument is, "no, warriors are way too easily killed on perilous" rampage being bugged doesn't factor in.