I have used them and I have mixed feelings. It really comes down to every member being fairly good at what they do, but are forced into the company of all the other types. Do you like flexibility? If so, the Court can work just fine. If you like having a toolbox that can smoke out IG from cover, perform slightly above average in assault, or provide some S5 attacks against vehicle rear armor, the Court can work for you.
If you look closely, however, no grenades. That is a huge hurt. The Court needs to be able to assault effectively in order to justify it's cost. That, and the only "spammable" member is the worst one, the Ur-Ghul. The Sslyth seems cool, but it is inferior in CC to the Clawed Fiend or Grot. However, unlike those, it has a shooting attack and better armor save (barely).
But, at the end of the day, it is just a pain in the butt to track a bunch of unique, non-character models in the same unit.