I agree, the variation is too much. But it begs the questions of whether you actually DO get to enjoy that higher clock during a sustained (I.E.: Gaming) load. I'd rather see a lower clock on paper that is sustained than a higher clock that lasts 2 minutes until the laptop heats up and starts throttling.
Plus, what about the thermal designs of these laptops? We're talking ultra-thin garbage here and my experience tells me that they cool poorly no matter what, but there's still variation and tolerances. Some components may tolerate a higher temp and power draw, some laptops have bigger batteries and bricks that provide more juice - isn't such variation then reflected here?