Well, it kinda depends. This is most subjective to everyone's vision.
Clawitzier it's a bit close to something similar to a "tank": meant to be slow, but able to deal large damage if it can endure the damage it recieves.
Maybe using it with trick room can help, since it's base speed at max level it's 59. I may recomend usign moves that take full advantage of its ability, Mega Launcher (which boosts up all pulse and aura moves. This includes moves like Heal Pulse, Aura Sphere, Dark Pulse and Water Pulse).
So... yeah, it's decent in my opinion. It's not fast, sure, but it gets part of the job done sometimes.