Ottawa is a big mixed bag, and covers a huge area. I lived there some decades ago, so it might be different now:
Regions north of the 417 are generally pretty walkable; and the transit way (looks like it was replaced with the OTrain) was quite effective at moving me, so long as it was along that spine. The transitway was so good that a bus from Bayview to the south (Greenboro/south keys?) was faster than the train.
When I lived in Kanata, there was sweet jack shit to walk, or even bike, to and the transit was pretty horrendous. The one plus, was that the express busses were pretty spot on for getting me to work, but probably only because I happened to be working on the transit way at the time (Ottawa U area).
In the times I've visited since, Ottawa seems to be doing the right things in individual neighborhoods, but is struggling a bit with making each of these good things connect to each other.