When it first came on I did not watch or care to watch it and only got into it from the repeats that had early on Saturdays, I now love the show. What got me was the flash backs, you saw where the characters were but not how they got there, you had a picture with missing pieces that interlocked to form the story.
You mentioned the polar bear but they tie was the comic book, the comic book came from Hugo. What does the bear mean, nothing really it did not have anything to do with the comic but you wondered, it was showing the island was not safe, and strange in the extreme, it was unexpected and farfetched but only at this time. Will it be answered, I think so.
TV characters are normally not too defined, only having a couple of traits, LOST characters are no different, this allows open ended devolpment and changes to personalities. Yes, LOST is a soap opera.