It takes an eternity to develop goalies, even the blue chip ones. Rask was drafted in 2005. He played a season in Finland, 2 full seasons in Providence (with a cup of coffee in Boston), and then 3 years as Thomas' backup before being ready to take over as starter. Rask may have been ready earlier and blocked by Thomas, but it still was a 4-5 year journey before Rask was truly ready. This is year #2 for Subban, he's not ready. I'll never understand why they did this.
J44thor- I wouldn't worry about Subban's contract. He'll be an RFA after next season. At best he'll be a backup next year, but he's not going to break the bank here.