I have to disagree with you on the Force Cloak, in no way does it qualify as a defensive CD. You can count it as an advantage/exploit to get a medpack CD back or to circumvent the BR limit by doing an out of combat rez all you want, but it does not provide you with a buff to help you immediately relieve incoming pressure without compromising the raid itself. Listing Force Cloak as something good to use is exactly the line of thought that got Assassin tanks a bad name in my old guild and throughout my old server because some ******s thought it would be a good idea to actively use it (some serious and some because they thought it was funny)....
The rest though I agree with, the three CDs of the Assassin are Force Shroud, Deflection and OS with the main short CD is Dark Ward, and expert use of FS and Deflection makes for incredible results compared to the other tank classes in the same situation.
It can be very useful.
Let's take the Dread Guards in Asation HM for example, when Kel'Sara casts Force Leech and you still have the probes on yourself from your Op/Scoundrel healer, FC will put a debuff on you that grants you almost 0 healing and you immediately lose aggro, you can then proceed to just click those probes away and step back in.