I was a faithful "Lost" watcher, however, a whole lot of it went right over my head. After it ended I had so many questions.
Honestly that is one of my favorite shows (possibly number 1). I loved how complex it was, and the constant suspense. Its the perfect type of show to binge watch, as its hard to remember what happened the previous week when I watched it live. The episodes were often times too dense. Season 6 lost me, but I enjoyed everything before that. The flashbacks, flashforwards, time travel, etc.
And I think everyone had tons of questions at the end. That was probably the point. I think if you answer all the questions, you take away the mystery of the Island, which the show is built on.