I like Transformers (which, a little known fact, was actually a co-production between the US and Japan... hense why they got Toei to animate it in its first conception)... but I never did care for GI Joe (not going into it) or He-man. But yeah, cartoons no matter from what country seems to vary. Personally, I'd love to see more One Pieces Shaman Kings and Kinnikumans over here than Pokemons... but kids love those stupid toys, and it really hinges on stuff that can be easily marketable (considering you can't really turn much of a profit on kid's shows anymore (not going into that either).He-Man and G.I. Joe come to mind!
I doubt we' see little kids clammoring for little Doraemon plushes... no matter how much I dream it.
But getting back to the subject... isn't it ironic that (not counting flash cartoons) that CGI cartoons just didn't have as much an impact on TV as they do in the movies? the only really successful ones that come to mind are Reboot (which came out in like 1995 or so) and Jimmy Neutron, Boy Genius... and those were both years appart.