does attack power increases hit rating?

[Svpernova09]

As other have stated attack power does nothing for to hit.

Just to clarify once yeh hit 80, caster need to hit this is will give yeh yer biggest boost in dps when going up against something over yer level.

Pali tanks dont need to hit or expertise. My pali only has 37 to hit and none of my other char can pull anything off em

Not sure about deathknights I think they need some to hit since a good chunk of there dps/tps depends on melee

No tank "needs" to focus on hit. expertise is something to be aware / mindful of, but gearing for survivability / defense cap is MUCH more important. Once you're there, if you're having threat issues, then gear for some exp / hit and you should see an improvement in TPS.