Beautiful, huge, Smithsonian quality museum. Seriously, if you live in southern New England, or are visiting, very worth a days visit (and it will take a good part of the day). Very informative with a lot of thought (and money) put into it. I really appreciated the incredible architecture and attention to detail of the history of a people and a place.
My only wish is that it had an exhibit area appropriate for small children. We brought a five and three year old, but there aren't any interactive exhibit areas for kids, which really seems a shame considering the subject matter. I can think of many Native American related activities that would have really held their interest. It would also have been nice if there were knowledgeable real people in the village area (or elsewhere) that were demonstrating activities or that we could have asked questions of (maybe during the weekend there are live demonstrations).
The other issue we noticed is that it's a little difficult to navigate the museum if you can't do stairs, since you have to take three different elevators to get from the lowest level to the cafe area. FYI the cafeteria has excellent unusual food with a native/local theme, and it's priced quite reasonably.