I like the aquarium. I've gone to it many times over the years since I was a little girl. I don't think the new england aquarium is a show stopper its not sea world lol its far more of an education experience and they do tons of research and animal welfare locally. They have some really good programs and there is alot to do in the area. I would recomend visiting their website to see what going on when your in the area.
I think I'm biased since I've been going since I was a child and have had a once in a lifetime experience from the aquarium. My niece was picked to go shake hands with the sealion when she was 5 and when it was her turn she just jumped foward and hugged him. You could see the look of fear on the trainors face and the poor animal looked at the trainer like what do I do lol then he patted my niece on the back. The trainer ended the session I kinda felt bad for the other little kids. But my niece and I have a great memory.
If you go I do hope you enjoy it as much as I have over the years.