Interrupts aren't good for positioning!
Here's a big glaring problem I am seeing.
One tool that is typically considered to be very important for Tanks is the Interrupt. It's extremely important because, as a tank, its our duty to position the mob/boss where it's best for the group to kill him.
In Rift, a glaring problem I am seeing is there is no tool that actually allows Tanks to do this, save, Silence which a Vindicator can conceivably get.
What WoW did to this end to allow Tanks to position ranged casters was to lock a mob out of a school of magic for a small duration so that tanks could use that window of opportunity for forcibly move those mobs to a more ideal location.
Beyond that problem, another main stay issue I am noticing is that if you interrupt a dangerous ability, the mob (or player in this case) simply recasts it immediately after they were interrupted. The interrupt especially meant nothing as your global cooldown will prevent you from doing most things to that player or mob in that duration till they start casting again.
I'd also like to suggest that Tank Souls actually get a good tool to deal with pulling ranged mob / classes. There were several tricks you could use in WoW (IE Line of sight or closing into minimum range) but there was never a GOOD tool to deal with these situations.
LOS pulling has, IMHO, always been something good tanks do as a crutch when no other option exists.
LOS pulling isn't a tool, its making up for bad design or mechanics.