As I promised yesterday, I came back to read your post and comment. It turns out I could have read it yesterday as it wasn't about episode four but it's ok, nothing is lost and never too late.
I didn't mind about the big reunion throughout the first two episodes but you're right about Sam. I was disappointed too. So many warriors died and Sam, (not a brave one) has been saved. Sometimes things don't make sense. I believe they have a purpose with Sam. I guess we'll see.
I've seen episode four as well, I'm looking forward to your review :)