The battle against Don Krieg continues in One Piece’s seventh volume, hampered only by one small but somewhat significant problem – Don Krieg himself is not an intimidating villain or interesting character.
Part of this comes down to his fundamental design. If Krieg has any character or power-related gimmicks, they are “weapons and ruthlessness.” His personality is based on only looking out for himself, which somewhat works in the context of this particular arc, but doesn’t make for a particularly engaging character. And his battle tricks lack the unique style or cohesion of Kuro and Buggy – he’s just a guy in a big metal suit who shoots a lot of cannonballs.