Actually, there are a few decent ones out there... Ninja Turtles definately being the best of the bunch. I also find myself watching Static Shock and X-Men Evolution (whenever WB decides to ever start showing it again)..
As far as the rest of the bunch, you are correct. Nothing but Anime imports that are a ripoff of the "Pokemon" phenomena.. We definately need more american made (or at least american developed) cartoons on Saturday mornings.
Not that I've got a problem with Anime.. I just prefer my Anime with a bit more story!
Just my 2 cents.