I'll speak on the Alberta experience (since that's where I'm from).
There's two different types of properties here: Judicial Listings (Court of Queens' Bench) and Bank Owned Properties. The former are difficult to buy, the latter have more potential.
Imagine the sellers' name is Rob. He's owned the house for a while, but recently went through an ugly divorce and managed to trash his credit rating. He can't get the renewal on his mortgage, and isn't making $200k a year in the oil patch anymore. Since he can't pay, the bank files for foreclosure at the Court of Queens' Bench.
After giving Rob a lot of chances, the Court puts the property up for sale. They are unwilling to accept less than market value (since they're still on Rob's side, not the banks). Eventually the bank can take back the property, or buy it for market value. That's less common, since the banks aren't in the business of real estate investing.
To buy from the Court you need at 10% certified deposit and an unconditional offer (schedule A attached). Since the courts will pay your Realtor, it makes no sense to try and do this one yourself. You're very unlikely to get a below-market deal since the Courts don't want to force Rob to take a loss.
However, once the banks have title back, they're able to sell it, demolish it or keep it. They are also sometimes willing to sell at a loss, or provide financing where you might not otherwise get it. Your offers will still have to be unconditional or have fewer conditions, but this is the sandbox where you can play and make some deals.