It doesn't matter what aspects or fragments exist. On paper, Hammer Strike is by default weaker than any other Shoulder Charge. Shield Bash grants an Overshield on kill, that's on par with the Hammer Strike Kill Ignition. Shoulder Charge has increased Range when Amplified, that's on par with the Hammer Strike Kill Ignition. However, the "I hit a target" feature of burning is just too weak and the "cone damage behind the hit target" is not really visible, since there is no Ash or something flying that way or so and you can barely differentiate damage numbers from the strike and the ignition.