I assume you're referring to Longfellow's Wayside Inn in Sudbury?
My wife and I were there on Saturday night for our anniversary. We were married on the grounds at the Martha-Mary Chapel, so it has sentimental value. The food is fine - but, in my opinion, the reason to go is for the ambiance. The original inn was built in the early 1700's and has been added onto over the years. We enjoy having drinks in the "old bar room" (the original tavern), especially during the cold weather when the fireplace is in use.
By the way, they recently constructed a new brick patio and plan to offer outdoor dining in the near future.
72 Wayside Inn Rd, Sudbury, MA 01776
Funny you mention this as your wedding venue, as we also looked at it as a wedding venue too. Ultimately, we decided on something else... Anyways, after the tour we had lunch. It was probably one of the worst meals I've ever had in a restaurant. The highlight of the meal was the packaged port wine cheese and ritz crackers they put on the table as a snack. It was all downhill after that. This was a year and half ago, so maybe it's better with this new chef.
It is worth a trip only if you tour the building, have a drink in the old bar, and then eat at another restaurant. The food is really, really bad. My in-laws love it and are always dragging us there for a family meal. I have never had a good meal there. The ambiance is great, but you can't eat that!