While Misdirection still doesn't have any secondary effects like Tricks does, you have to consider the fact that it can be used at range which is a pretty big deal. While the abilities have similar effects, they'll be used for wholly different things. It's a threat management tool for Rogues, whereas it's a pulling ability for Hunters. The two abilities fill different roles despite their similarities. Hunter threat tends to have some pretty wild spikes sometimes, but I think they have all the threat management they need. Feign Death is on a 30 second cooldown, and the Rogue threat wipe is at 3 minutes.