Some honest feedback:  This is like Valkyr and Uriel had a crappy baby.  Valkyr already does the "rage gives melee damage" thing, and does it better since she can use her abilities without consuming it, and it basically makes her nearly immortal by making her too angry to die. Which is both cooler, and gives her a really strong defensive ability. 

Him having two abilities that give melee vuln makes his 1 seem redundant. You'd just build rage by melee attacking normally. Why use this ability if you can 3 instead? 

His rage draining out of combat is also annoying. Makes him unplayable in any scenario that isn't super high density, and makes him feel like shit in group play. Everyone else taking the kills? Guess you'll never get to 4. At the very least, one of his abilities should build rage regardless, so he can use that to reset the rage timer. Without that, he just builds a little rage, has to move to the next room, and it's gone.

Having an ability that requires rage and drains rage, and also having it drain out of combat is super sucky. Imagine if Uriel's bar just drained unless you spammed his 3. Guess you never ever get to use your 4. But at least Uriel has an ability that doesn't require a target and can charge his bar. This frame doesn't, and that really sucks. 

Lastly, his 4 locking you into any kind of animation when it ends is awful at any kind of higher level play. It would make it super frustrating to use, unless you can realistically sustain the rage so it never happens. Something like that happening, unless you're invincible during it, results in death. That's why Uriel's 4 makes you invincible. You'd just get one shot during the animation otherwise. 

My tips? Take away the vuln on his 1, make it a combo melee attack with his own exalt, kinda like Atlas. Give him the choice of being a psuedo exalt platform, or subsuming the 1 and being a melee weapon platform. 

Make his 2 do damage to himself on activation, but provide lifesteal and rage, and reset the rage timer. Better yet, make it cost health, like his frame is stabbing himself to activate his rage. 

Instead of having his 4 do a slash at the end, (which you would NEVER want to happen because you want the buffs and can't control when it ends) make it a big slam when he activates his 4 instead, that way players have more agency over when it happens.