The problem with a turret is that while it has better flavor for Survival than the random snake, it also is immobile. Have you ever played a Marauder DH in Diablo 3? Go find old videos of the Marauder set before they changed it so that you did more damage for each turret... the old set bonus used to be that your sentry turrets did everything you did, so you had to place them in a cluster, then go and kite mobs back. It was a pain in the ass.
In WoW, a turret would be a terrible idea, because things move around so much (unless it had a huge, 40+ yard range). A turret would suffer from the same problem as Mirror of the Blademaster - You activate it, then ten seconds later the tank moves the boss off the effect. The only reason Mirror isn't crap because it is massively overtuned (in CD length, activity length, and raw damage).
Regardless, the talent as a whole makes me cry with how uninteresting it is.