I never really got into Monster Rancher. Saw maybe 1 episode where they all saved some girl named Holly and some other one with a wierd duck, but that's just about it, so I can't really give an opinion about that.
Yu-Gi-Oh is okay. The "heart of the cards" stuff is boring crap but the duels are pretty good-When Yugi was dueling Pegasus, now THAT was awsome!
P.S: And if you must know, I'm actually starting to like Big O (And just so you know-That Theme song is still as terrible as the Sailor Moon theme song)