The Pavilion: The buildings take up 1 acre, the gardens take up .4 acres, and, here's the disheartening part... the forest takes up .6 acres.
So, the gardens, while nice, are a bit... guarded. There are no benches in the area to sit and enjoy them. No table at which to eat. You walk through it... quite literally. One path through it... not even a loop to see it from other angles. The gardens could be expanded to twice its size by taking over the copse of trees. You could add benches and tables. Otherwise the gardens are OK for a quick look and being ushered out.
If one thinks of other buildings or attractions or even a QS that would befit Canada, you can use the gardens and tree area and pretty much double all the building space.
I find the waterfall to be really nice. But I only remember it's there when I bring new visitors to O Canada. They're so hidden from the WS walkway.
While Martin Short is so... Martin Short. And I mean that both in a complimentary and critical way... O Canada does an excellent job representing the country (except for the pedestrian "lyrics" of the final song). It would have served the movie better for Martin to have filmed on location than a studio green screen. And at the risk of being reported by
@marni1971, it's much better than the outdated Impressions de France.
While the stairs are quite a challenge for us USians, luckily, there are bypass ramps for each flight of stairs. They're just not very noticeable.