I created an assault marine in the death watch game I'm playing in - our group consists of an Apothecary, Devastator, Librarian, Tech Marine and Assault Marine.
I assumed I was supposed to be the best at close combat, because my name is ASSAULT marine, but after a few sessions of play I've found that the Iron Hands tech marine has a FREE power fist that can attack as a REACTION in addition to his actions for that turn. The Omniscian Axe is one of the better power weapons in the game, he can replace his entire body with machine parts for cheaper than everyone else AND he gets Artificer Armor at rank 4 when no one else can get it until they're a Hero, and they take it as Signature Wargear.
the Librarian has a Force Weapon, which allows him to pump psychic power into his weapon to deal extra energy damage to enemies, and can basically bend the laws of physics and reality to his whim if he's willing to risk the perils of the warp.
I start with no special wargear other than a jump pack for free, and I can attack twice as a full action at rank 1. I don't deal particularly special damage, I don't start with a particularly useful melee weapon, and I have no special skills other than being able to jump pack (Potentially hurting myself in the process because of the falling damage rules) and basically get overshadowed by these two in Melee combat.
I'm a little upset here, because it seems like being an Assault Marine is pointless. They don't get very much at all. Maybe someone can explain why I'm called an Assault Marine, if I'm not particularly skilled at Assaulting.