Quicktime isn't an editor. That won't work.
iMovie is pretty terrible, yes. It's the Mac equivalent of the free Windows Movie Maker, which also sucks. That's what you get for free. You simply need a better editor.
Some older tools like Avid Free DV and Final Cut Express work nicely, but it will depend on your version of OS X. Some OS version may not official be supported, but it will still work. Try those.
http://www.digitalfaq.com/forum/vide...d-free-dv.html
Mac has a limited workflow. It is DV centric, but it often requires pro-grade tools like Premiere or FCP to have a good experience. Unlike Windows, or even Linux, Mac has few options for video. I have a Mac, and it's fine for DV workflows, but I'm doing editing with Premiere and FCP.