Kdenlive
Even something as basic as opening a video file is a huge challenge. I can't just open a video file. Instead, I need to "create a new project", which requires that I specify the exact resolution and FPS of the video file beforehand (why!?). After I use a completely separate tool to extract these attributes from the video that I'm editing, I have a blank canvas onto which I can drag the actual video.
The UI is somewhat clumsy but I think it is pretty good that we have an open source video editor.
This of course is most likely a skill issue at my part but it really feels to me like kdenlive is getting in the way of my flow much less than davinci
Very nice color options though, that part is hard to beat