Cinelerra sucks mostly in coding. Better just save MJPEG and use ffmpeg theafter.
What I find interesting is how there is so much support around Blender, including that from the effects industry, yet hardly any for OpenShot or Cinelerra. Before OpenShot, video editing on Linux was a wasteland... I remember around 2008 your choice was Cinelerra(hard to install and is actually a compositor), Pitivi(most stable but lacked many features and the devs went AWOL for a while), and KDEnlive(most advanced but had constant problems and looked hideous outside of KDE).
EDIT: I just want to make it clear that a lot has changed since 2008 and it looks like Pitivi and KDEnlive are still active projects.
Lumiera is a fork of Cinelerra that's slightly more editor-focused, but development has been very slow.
* open and free software
* good tools for color grading and perspective correction
* getting multiple sources in sync could have been easier
* I don't know if I ever tried to edit HD
* I got tripped up by the Linux color space (gamma?), resulting in dark videos