One of the problems with making hit and expertise interesting stats for tanks is that, in many ways, they aren't interesting stats period. They both do almost exactly the same thing (prevent an attack from dealing no damage). Contrast with haste which lets you do more things and do the things you're doing anyhow faster, or crit which sometimes makes the things you do really big. Likewise, dodge and parry do basically the same thing, and only a few talents (Hold the Line, for example) make one more interesting than the other.

There is some pretty major room for crit and haste to be interesting to tanks, however. With druids, their mastery already integrates crit in a very nifty way. With DK, haste is a weak survival stat, since it allows you to use death strike more frequently. With hit and expertise, unless you add in a lot of overly complicated tweaks, they just won't be interesting, as misses and boss dodges and parrys simply aren't that common. Adding in a proc for warriors based on crits is significantly more interesting.

Of course, the problem with integrating pure dps stats into a tanking system is with gearing, and that's a whole separate kettle of fish.

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