That's because you're using a program designed for cutting 3D meshes for 2.5D parts. Plenty of 2D programs will give you faster, better results.First off the cutting time takes FOREVER for a simple part.
However, a lot of MeshCAM users cut similar parts with acceptable results, using waterline and pencil toolpaths.
I've been a MeshCAM user since the very first beta, but I can't help you with those settings, as I'd use a 2D CAM program for a part like that.
Regarding the gouges? Is you're stock set to the correct height in the stock setup dialog?
Actually, it seems like the problem would lie elsewhere. All the red rapid lines in the MEshCAM display should be at the same Z height, but only a few of them gouged you're part. Perhaps the machine is losing steps?
Looking at the screenshopt again, though, it looks like the white stock outline is lower than the top of your part. So maybe it is a stock setup issue? Or a Z zero issue?