I'm always cautiously optimistic. The reason I am this season is that our team has changed a lot. Yes we have added potentially great pieces to the team, but chemistery is a real thing and there is no way of saying how it will happen.
My second reason for concern is that while I believe McVay to be a really good coach, but he was helped by the fact no one really knew what to expect last year. This year we are on everyone's list and his strategy will be intensively scrutinized. Maybe he adapts well, maybe he keeps everyone surprised by pulling new tricks out of his hat, or maybe he doesn't, and copying Zimmers or Peterson's strategies against us last year pays off for our opponents.
Last thing is that every year we see serious contenders, sometimes favorites disappoint, look at these SB predictions from a year ago :
http://www.nfl.com/news/story/0ap30...dictions-patriots-raiders-steelers-head-picks
None of them had Eagles, or Vikings, or Jaguars, 3 of the 4 conference finals teams. Many were high on the Raiders who seemed poised for an awesome run. The NFL is just hard to predict.