I don't agree with some reviews stating that it wasn't like NCIS or it was a bad premiere. I think that it was great. My main point is that you just can't expect a show to follow its routine all the time. Following a routine must be feared. There was actually no case in this episode, almost no Ducky, no Abby, no Palmer, but there was every bits and pieces of NCIS and it followed the last season's finale.
I also think that seeing Kate's sister one more time was quite good. Plus, DiNozzo's interaction with SecNav (Jarvis) and also Gibbs' interaction with Jarvis was worth watching.
Beside these, it was a dull episode, but I missed it for 4 months, so I am not disappointed.