This is in PvP - so, it must be different - typically two things will happen:
1) I'll get in range of someone, they'll stand there for a few sec's and run off - then while SS is casting since it takes so long, they're out of range.
2) They other likely thing to happen is that I'll be spotted and get hit while casting in PvP because of the long cast time, which will cancel the shot since I'm no longer stealthed.
Basically this makes this CA almost useless against anyone in PvP ( that's not AFK ). It makes it useless in PvE because the long cast time pulls away from your DPS. I really don't understand why our top damage CA should take 3 years to cast. It already does significantly less damage than decap does. Decap casts really fast.
It seems like the guy in charge of developing scouts has a big time assassin biast.