You don't need an attack table for Elemental damage, but the spells that do an unresistable crit are pretty much all avoidable. They take time to form up, so if you get out of the area in the first round, you're fine. But there's no Wall of Fire attack table. A good number of E spells do a crit, really. It isn't a consistency issue; it is a balance issue.
Although, Craig O'Brien went back and forth on this. I still have the mailing list message where he stated that it was a Force spell, so if it had a target capable of resisting (as it could, if targeting an air elemental), there would be an RR, but since it is just targeting normal air most of the time, there isn't.
Mind you, Craig reversed himself on that not too much later, but it isn't a bad argument.
