Originally Posted by
Technolust
As a tank class job you need to be able to target monsters first, over anything else. The only mode that allows you to do this is /tmode b with enemy targeting as the selected option. The Function key that was designed to target the mob closest to you does not work. /btmode on only works for enemies you actually have enmity from. Direct targeting, which is supposed to target the closest monster to you does not work either.
As I mentioned above, and since you don't have a tanking class at level 50 to really see what I'm talking about it isn't as simple as you make it out, especially since most high level groupings now are multi-monster fights.