Sorry to read of your experience. When you asked them and they told you there was plenty of room, did they know you wouldn't be there for a while? A lot can change in 90min.
Count yourself lucky the wait was only an hour, it's a popular place. Many places that are right on the water like Kentmorr, (especially crab houses), can have waits of 2, 3, or even 4 hours if you just roll up in the middle of the day on a sunny weekend. Next time you visit a restaurant on the bay, either be a little more flexible or show up early.
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