Scar
Super Freak
Probably would have made more sense (in the grand scheme of the film) to call this a T-600 Heavy Infantry or something. That way you could justify why he's so out of proportion to what an infiltration model would/should look like.
That's exactly what I'm thinking too. The T-600 is a war horse, not a Trojan horse. Its job isn't to sneak behind enemy lines and infiltrate humanity's ranks, but to confront them head-on on the battlefield. T-700 was a step toward the T-800 and an efficient infiltration model, but I think it all originally started with the T-600, maybe to give a greater psychological effect when people have to blow away bots that look very similar to humans. Skynet is anything but foolish, it's all part of a carefully formulated plan.