The short answer:
Climate: You can sail year-round, winds in the summer are typically lighter. Rarely any thunderstorms to get concerned about. Winds are usually out of the NE or SW.
Scenery: We're spoiled, being able to see mountains on all but the rainiest days. Puget Sound has a lot of housing along the waters, but still quite forested. Only a few really severely urban areas, like downtown Seattle or Tacoma.
Moorage: Slip availability is difficult, it can easily be a one year wait. Costs for a 34 could range from $250-450/month, depending on whether you're directly on the sound in Seattle, on the lake behind the locks, or farther south or north from the urban concentrations.
All said, there's a lot of deep water and plenty of interesting places to explore, including up to Canada and Alaska. Tidal ranges are about 12ft daily, so currents in places are always a consideration.
Craig