Really sorry to hear you've had that experience. I'm the PM for CI and we're really proud of how our CI product in particular has been rated by industry analysts, and how we've maintained interoperability, though of course that doesn't speak to where you've struggled with our solution. If you'd like to chat about it sometime I'd definitely be up for it.
My company uses GitLab and I think the CI is fantastic, especially compared to Jenkins, Travis, Circle, etc. It's very easy to setup, incorporated into the rest of our workflows, intuitive, reliable, powerful. I have a few complaints but i see they are on the upcoming roadmap.
