I doubt I'm that good.. I had trouble with a boss just now >.> died twice before I switched in Snow to take all the damage.
I myself didn't leave the farm spot in that video till I had maxed the main three cystariums for everyone. Well, maxed as far as you could go at that point.
I used Snow maybe twice my entire game (not counting times I had no choice). In my opinion he's just horrible. Sure he can take a lot of damage having the highest HP and all and is the best Sentinel but his damage output is so horrible it's just not worth it to me. If I need a Sentinel, Fang or Lightning are more than enough with the right equipment and such. Fang is more of a "I'm going to let you hurt me some, but I'm going to hurt you right back for a lot more for hurting me" type Sentinel (Vendetta and Entrench).