Well, Tantalum may have made the numbers sound a bit less significant than they are. True, there is no reason to nitpick every detail - but those numbers still are related to real world measurement systems, which allows, in its turn, to compare a given character's abilities to real life processes. For example, how many Vulcan rounds does your opponent's punch equal to, and how your armor, which is ten times as durable and has the capacity to absorb about 15 times the kinetic energy a Kevlar vest can, will react to this strike. And if you do it right, there will be no need for any arguments at all.
Morever, it is just much more simple and neat when you write the numbers instead of something like "1500 trucks falling onto your face from the Eiffel Tower", and it is sure easier to compare characters that way as well, to knoew who will have an upper hand in battle. Seriously, even "1 truck off the Eiffel Tower" is actualy a darn unit of measurement, and you can be sure that a character who punches with 1 truck of force is weaker than one that can with 2 beacuse of that.