I have attended several events here over the years (Expos games, car shows, Black and Blue) and the Olympic Stadium has never disappointed.
I also saw Madonna here in 1992 for her "Girlie Show" and even though that was super spectacular, the acustics here are not the best.
Yes it is an old monstrosity, and I saw some water dripping in places.
The roof does not open anymore (poor design). But overall I like looking at it from a distance, as it is spectacular looking.
Another good thing is that the Metro is connected to it, so it is very assessable to downtown.