I can personally vouch for Cu, Ushi, Hans, Medea, Asterios, and Kiyohime. Not to mention Mash, of course. Though they're missing Euryale and David in the Archer section. Probably weren't out yet when the guide got made. Still, Caeser can be pretty good even if you do have a Gold Saber, since I believe he's single target, which none of the Artoria are. And yes, three star rarity is the lowest Sabers go~ Even in the Japanese version. Well, of course, only one Servant has been added below 3* since launch, and it's a Berserker, anyway.