Also, remember that previewing your project on your monitor (a progressive scan display device) will look different to how it will look on a TV (an interlaced display device) when your final project (cut on DVD?) will look.
My first DVDs had me worried and I spent a few hours trying to find settings that made my project look right. For a while I thought home video editing was just BAD, until I finally bit the bullet, cut a DVD and watched it and all was fine
Afterwards a bit of hunting around and reading and i did come across some explanation.
So, if you have a DVD-RW to hand try cutting a test DVD (maybe only a few secodns of fottage) to see if you really have a problem or not. You might be as surprised as I was.