Overpriced yes, but garbage? Heroku is definitely stagnating, but they were integral to a whole new genre of PaaS. Heroku got a ton of people's first apps online. Even today their 12 factor app methodology is incredibly useful/powerful.

Now that said I totally relate to having strong negative opinions after being burned. I've got a few orgs like that too. What did they do for you?

Edit: nevermind I should have refreshed. You already answered in a sibling comment