Completely agree with all of your points. I just finished migrating from Mandrill to a new Sendgrid account and it was pretty seamless (although I had a head start because I have used Sendgrid before). It took me about 45 minutes to update everything, including: creating an account, adding appropriate DNS records for whitelisting, and updating my application and server settings.

It's extremely unfortunate that we have to do this, but no way would I stay with Mandrill after this decision.