For my taste, the best format for an action match is the way Kaci and Pagulayan gambled. Best three out of five races to 21. Plenty of pool, and no matter how things proceed, each player tends to be in with a chance to win the match until the end, which is what makes it watchable.
Three out of five races to 21 is still a marathon of the highest order, but there is far less danger that the match will turn into a snooze-fest, as so many of these long races do.
I agree, such a format with a tremendously long race isn't very fan friendly, but they aren't really playing for the fans. They must both agree that this is the best way to determine who the better player is in such a game.
However, I must say that Dennis' unbelievable comeback in the last race they had was very entertaining. Once he started to make his comeback, I did purchase the stream and watched it to the end. Very suspenseful and exciting.