DVD cameras are a WAAAYYY bad idea.
Just think...
A portable cd player skips, even with anti-shock capability, it still has to interpret that data to read the audio in the event of movement.
A DVD spins at a much higher rate, with a MUCH smaller laser, and the stream contains much much more data. The chances for corruption of the data write process alone is enough to stay away from the DVD camcorders.
Secondly, the expected quality of DVD is only possible when using the disc's write speed at a normal 30 minute rate. The resolution is the same, but the compression kicks in at the 60 minute rate, and your video could under certain circumstances, look like webstreaming video. You don't wanna know what will happen if you want to record anything with high detail and a wide colour palatte. Think Lego-look. MiniDV has no such artifacting in high data rate scenes as previously described as it does not need to "think about" what it just saw and then write it to the disc.
On top of that, the MPEG compression of DVD format video was never really intended for editing. I will leave the mind numbing technical details out and say that editing the MPEG files is somewhat the equivalent to making a copy of a copy, the copying it once more to get your final video. The data has to go through several compression scemes on its way in and out, and at each step it gains more artifacts... not good. The MiniDV format has mush better compression schemes at work. The format was intended for editing, and the end result product is almost entirely accurate thruout the process.
Another issue is blank media availability. You can walk into almost any typical corner store and find MiniDV tapes.
I wholeheartedly reccomend the MiniDV tape format for consumer use.
And BTW, I do video and film editing/shooting for a living... not sayin' that I am "all that" I'm just giving my perspective on it here.
<<edit: broke up some paragraphs>>