It doesn't matter how safe it is if devices can't connect to it. WPA isn't universal, WEP is. Now, the one device that doesn't support WPA (NDS) may be the only thing, but it doesn't support WPA. It looks like I'm going to have to run two routers, my main one in WPA and my old router in open mode if I ever want to play DS online. Right now I'm in my dorm and the router is set up WPA at home, so it's fine for now, I guess I'll just use my old router for my DS if I ever want to use it.
I know about all the hacks. WEP isn't a solid brick wall of security, but that's not really what I want anyways, I just wanted something simple to keep "ordinary" people out. There are plenty of open AP's near my house anyway, so the average person would go for that instead of hacking WEP. My point here is that they shouldn't introduce new, incompatible stuff just because it's safer than the old, universally accepted and supported stuff. They should make the new safer stuff backwards compatible with the existing stuff that people have so that people don't get stuck with insane incompatibilities like this.