Personally, I thought this season started out as one of the best and was pretty exciting, but I have to admit that these recent episodes have either felt pointless or annoying. I'm with Griffith that it's annoying for the writers to lay out the rules of time travel (which they keep trying to explain to the stupid masses with the constant reminder of: "This is our present, we don't know what's going to happen or if any of us will make it out alive") just to try to completely throw those rules out the window. My feeling/hope is that this is all just a naive thought by the characters and that the rules are rigid like was originally laid out, but if it isn't I'll likely lose a lot of interest for the show. They're already skating on thin ice with this whole time travel stuff, but if they allow tampering with the future etc.... well... ugh.