You know... I said magical more as a sarcastic phrase. You see what I mean?
I wasn't even talking about the actual ability, and it gets rules lawyered.
It may very well be a house rule, but it is the way it should be. I really don't get this DM vs. PC mentality. It makes it stressful for the DM, and it makes players into rules lawyering douche bags.
A player shouldn't have to find loop holes to ensure entitlement to something against the DM...
As I mentioned earlier, but a bit more direct...
Screw stats. A ranger gains his bonuses because he is used to fighting creatures of that type for in character reasons. If your favored type of enemy was an alien of some sort, he would know to fight it because the heart is on the bottom left of...
A ranger favored enemy shouldn't be distinguishable by the characters intelligence, or whether or not that person/creature is wearing things befitting of that enemy. A ranger is an expert, and should (hopefully) have some in character reason for having his favored enemy. If the enemy is undead...