It was for me.Despite certain parts of CM's journey to find her stolen life being interesting in the first film, I'm seriously doubting anyone--with an objective mind--can say her debut was the foundation for interest in additional stories.
I'm sorry, but really need to stop assuming that everyone feels the same way you do. Every time you talk about something like this you seem to assume everyone has to feel the same way you do, but yet in 99% (OK maybe not literally, but it sure feels like it) I feel the exact opposite of how you say everyone feels, so I continue to be proof that you do not speak for everyone.
If you want to share your opinions that's fine, but please stop acting like you know for a fact that every single person who has seen these movies absolutely must feel the same way you do.