Personally, I fear that particularly fire walls would become far too powerful if items on a person have to make RRs or catch fire.
That said, I DO wish the fire wall was a LITTLE more potent. It's the same level, and has the same duration, as an earth wall. While an earth wall usually effectively blocks any opponent trying to get through it for the duration, a fire wall can be passed at the cost of taking an "A" crit - although it probably has a far larger psychological impact on your foes than an earth wall would. I don't see this as a problem, but I dislike it being an "A" crit for one reason: Any Large creature can simply walk through the wall completely unharmed. It is possible that causing a "B" crit makes the wall too powerful (especially if you try to cast it ON someone, but I don't think that should be allowed anyway), although I doubt it. But even if it DID, I'd like the spell text to say "...however, large creatures also takes a crit when passing through the wall" or something like that. Oh, and the same goes for "Cold Wall", obviously.
