All in all, I thought it was a great first episode. There are still alot of questions to be answered, but I heard the creators say in the pre-episode that answers would start to come with more regularity. That pretty much jives with the fact that they have only this season and the next to wrap things up....not alot of time for a show this complex.
Personally, I'm hoping they don't spend the ENTIRE season trying to locate the island and get the people back on it...maybe just half the season.
But I guess only time will tell.