2. Breaks from AoE.
3. Breaks from pets, as pets just ignore it and continue to target you. (Known bug)
4. Its only reliable function is to get untargeted for a split second, much like Hunter's Feign Death. That's nice, but not at the cost of a talent slot. It is noted that Feign Death is baseline for hunters.
Spectral Guise should just work off the Rogue Vanish mechanic to fix these issues. Easy fix Blizzard. (Took Blizzard 7 years to get Vanish right so why re-invent the wheel)