As an outside observer from Buffalo, I am amazed by the negativity on this board. Your team lost a ton of players down the stretch to injuries, you're still missing your captain, Oshie is clearly not at full strength, and you are 2-2 with the defending Stanley Cup champs.
And no, Ryan Miller is not God, or Dominik Hasek. He is not going to completely shut down one of the top offensive powers in the NHL, particularly since your defense does break down sometimes. Ryan doesn't get shutouts, but he is a very good goalie who will occasionally let in a softie (often from long range), but will make many spectacular saves and will always be solid. He's good enough to backstop a team to the Stanley Cup, but he isn't going to carry the team by himself.
Is Miller substantially better than Halak? Probably not, but he is more experienced, and consistent, and has performed well under pressure in the past. He is doing well now, considering that the fans here basically will regard the trade as a failure if the Blues don't win the Cup. Try playing under that spotlight some time.
Your team is deep, plays hard, and is well-coached. Unfortunately, they are in a conference that is loaded with good teams. I say enjoy the ride. Good luck. Like many in Buffalo who have come to admire Ryan Miller as a player and a person over the years, I am rooting for the Blues to win it all.