Well, the point he was trying to make was that the power only specifically mentions it affecting "creatures", so RAW, even if a vehicle is in the blast radius, it is not affected. Not sure if that was the intended effect though…
That is a good point and one I intend to raise to the GM.
Other powers specifically affect vehicles or "any target"
Machine curse, "… target a single vehicle (such as a battle tank or landspeeder) or a number of mechanical devices (such as guns or servitors)…
Might of ancients, doesn't specifically mention vehicles, but does increase your dam and pen on melee attacks (power fist anyone?)
Vortex of Doom, Anything that touches the vortex must take agilty test (vehicles fail, or does the driver take one?) or take damage, not designed with vehicles in mind as the rules weren't out yet, but should still work. Would need high PR to do enough damage to beat heavy armor though.
Blood Lance, anything hit, though the units hit get all their armor. Again not designed with vehicles in mind but possible to do damage anyways.
So there are options. Get your boyos using something other than smite all the time!!
I am liking what I see in the Only War beta for vehicle rules. They have hit locations and crit tables for the various locations. Among other things.