Well, it's great to have Lost back. The first thing the viewer will notice is that the show is actually much easier to follow than a past times. There are not as many strong metaphors and there are not as many visible plotholes.
However, there is still plenty of mystery. The viewer will still ask a lot of questions, and very few of them will get answered. But that's part of the fun of the Lost, as the show is certainly as intriguing as it was last year.
One thing to note is that if you are not a fan of Jeremy Davies, who plays Daniel Faraday, you may not thoroughly enjoy this season as he is a big player in the first hour and will become an even more significant part as the episodes progress.
But Ben is still as devious as ever, Sawyer still cracks his Southern style jokes perfectly and Jack is still searching for peace. This was an excellent episode and it's great to have Lost back!