I think that Aspect of the Turtle is decent but to me it's just deterrance with a different name. One thing that has bugged me about hunters since the beginning is that our only defensive takes out our ability to dps. I know that mages get ice block that does the same thing but in WoD warlocks had Dark Bargain that gave them 8 sec of immunity but they could still dps. That's my issue.
Aspect of the Cheetah - Really sucks to be honest. Let's look at other class speed boosts/movement boosts:
- Dash (Druids) - 15 sec 70% speed boost on 3 min cooldown.
- Sprint (Rogues) - 8 sec 70% speed boost on 1 min cooldown.
- Roll (Monks) - while not technically a speed boost it's on a 20 sec recharge (dps spec) with 2 charges and does what speed boosts do - moves you out of trouble.
- Blink (Mages) - teleport you 20 yards forward on a 15 sec cooldown
- Heroic Leap (Warriors) - 8 to 40 yard leap that goes to a specific location and actually does damage. 45 sec cooldown.
- Aspect of the Cheetah (hunters) - 90% speed boost for 3 sec and then 30% speed for another 9 sec on a 3 min cooldown.
Now yes out of combat MM hunters get a passive 25% speed boost from the artifact and SV/BM can reduce the CD of Cheetah via traits. Still not even close to comparing in my opinion to the other movement abilities. Now if the baseline cooldown was 2 min and no reductions I could be okay with that.