Sure. I can tell you why she's so limited on rage on every fight. I'm betting she's spamming maul every chance she gets. I'm also betting that even as the last mob of a pull dies, she's still trying to waste all the rage she can, instead of trying to build up rage for the next pull. It's very unlikely that a DPS is going to pull aggro in the last 5-10 seconds of a pull, and that's when you should be building rage for the next pull. But of course, your wife's rage is empty.

If your group has to drink up during every pull, well then I feel sorry for you. Find better people to group with, or find people who realize that a mage table gives up to 50 stacks of mana biscuits, more than enough to spam whenever they get to exit combat. If you don't have a mage table... well then realize that waters are also very very cheap compared to the current economy, what with dailies giving many times over what would cover the cost.

And no. A 500 frontloaded threat doesn't beat having over 50 rage with which you can go to town with on multi-mobs. I'll take a maul + mangle (both of which have massive threat bonuses tied to them) over a SF minus all your rage any day.