Well its just aesthetic wise, as said, the Clockwork Goblin stuff looks like blown up 15mm files. Meanwhile Dust's mechs, whilst obviously being from a larger scale, don't look nearly so, well toy like ...I mean 40k styled, or am I mixing the two of those up?
They're doing what they can, but looking at the pair of German ones I'm finding it difficult to work out how to bring them up to snuff (zimmerit, if all else fails then that'll cover the lack of detail). However, I have similar criticisms of Warlord's vehicles, so perhaps the two companies are made for each other.

*Snittiness overload*
Hey at least the short barrelled one has one of those turret grenade launchers like they were adding to the late war tanks. I was wondering how on earth the crew are supposed to defend themselves against any infantry who make it up close (those legs looks far too un-manoeuvrable for squashing the unsuspecting buggers). ...Though maybe I'm assigning too much thought towards practicality when it comes to such a ludicrous concept (someone'll have the Red Skull popping out of the commander's hatch in no time).