Oh, I loved the four player free-for-all play of the Gamcube version.  I was disappointed when I saw the DS one was only 2-players online.  I'll probably buy the next iteration of the series, but I decided to skip over the DS one for that reason.
Anyways, if it plays like the GC one, which, from what I can tell, it does, I'd say pick it up, since Europe didn't get the GC one.