Olive is great
Olive 0.1.2 branch is an excellent, simple(ish) video editor with some great community created effects and very good performance. I use it frequently to create training videos and its rock solid stable. Its an ideal first time video editor for new users with a simple interface and a suprising amount of features. Only problem is there are no binary packages for it and you have to compile from source which most users are not going to do. The new olive 0.2.x branch is still a bit of a mess. Its getting there very slowly and hopefully will be ready for production use soon but its very buggy for me with frequent crashes and incomplete features
I ended up creating my own fork of 0.1.2 with a few fixes and baked in community themes which I will keep using till the 0.2.x branch reaches stability