Aye, but do we know the strength of Warcraft's magics? Such as flame strike, blizzard, star fall, searing arrow, storm bolt (crash into marine's helmet), poly morph, cripple, death and decay, frost nova, infernals, Entangle, etc etc... I can keep naming them, chimeras would probly annihilate ground units as well, along with frost wyrms.
Of crouse, lasers would probly do one hit klll to most units, but like I said, air units in warcraft could do wonders (i.e. masses of them go inside carrier and pwn all newbs lol)