When it comes to a throwing projectile as a melee, I believe that it should need a way to get it back quickly, since there are no other benefits to it other than it having range, but it still requires skill, mostly for PvP. However, unlike other throwing melees in other games, these are present in a shooter game and made to be one of your special abilities. With the amount of skill needed and the nature of a throwing melee, it's already balanced, but it's simply not enough in a shooter game. Just look at the present state of throwing knife and throwing hammer. They're practically useless. There should be a way to get them back quickly. That is why I proposed summoning back your hammer from wherever, having an animation tied to it to balance it. This is needed even more, since the entire tree is built around the hammer, resulting in 3 out of 4 of your perks becoming useless once your hammer is lost. Running after your hammer to pick it up is unreasonably stupid in the middle of a fight, where you'll likely be killed and your health regen will cancel out immediately even if you manage to pick it up. Throwing knives should also have a way to get them back quickly. I've strictly mained this tree for PvP (competitive also, I've gotten good with a bow, check my game history) and PvE since its release, playing with it enough that I have found the necessary buffs to balance it. All I can say is trust me when I say this.