The update concept was good, releasing 5 past stages in a single update is good. But I did not like the stages that were released. I think they could have posted better ones like Yoshi's Story and Dream Land 64. Here are my opinions on each of the stages
Yoshi Island- I hated this stage in ssbm. It has a walk off edge, and I am not a huge fan of them. It has an extremely low ceiling, which Fox can abuse with up throw - up air and use it to kill at very low percentages with ease. The destroyable boxes, especially the ones in the center are extremely annoying. I never liked this stage.
Corneria- I like this stage, but I expected it to be in Brawl in some way. But I don't like how the bottom right part encourages camping. But overall, it is not a bad stage and is the only one I like that was announced in this update
Onett- I don't like the stage since it has walk off edges, but that is my only complaint. I like the stages music, it was really enjoyable to listen to. This stage's confirmation gives Ness a better chance of returning, which I want to happen because I hate the idea of taking out characters.
Brinstar- I don't like this stage. I never liked any of the Metriod stages because of the lava. Lava gets really annoying and just makes stages not fun.
Rainbow Ride- I am neutral on this stage. I don't like moving stages, but since this has a set path, it is acceptable.