User blog comment:Twelveseal/Class, Skills, and Stats/@comment-65.95.182.78-20130611143640

Stats altered by their stories (Drake's EX luck from Setter of the Stars for example) and the berserk augmentation aside, I think it functioned primarily as a tool not just to reflect the Servant's strength, but to establish a system that would allow an individual to see and compare his/her legendary status at a glance. Saber/Stay Night's beefed up stats, for example, obviously don't reflect the King Arthur that might have existed, but what the idea in people's hearts throughout the ages allowed it to be. This stands, by contrast to the crappy Assasin/ZERO. Furthermore, in the context that Nasu likes table top RPGs, it's just fun to look at detailed descriptions of their limitations in spite of their being heroic spirits summoned with insane amounts of magic. That said, I think it'll be a little harder to do those stat checks in other areas of the TM universe where they weren't summoned by the Grail (the Berserker in Rani route, the secret boss...). However, I think somewhat detailed looks at their skills is possible.