If you mainly want an e-reader, I recommend one of the other Kindles that has an E Ink display, which is wonderful. The Fire doesn't have an E Ink display.
Not just critiquing this particular model, but at least a couple things that need to be improved upon in game prediction:
1. Need to take into account playing styles of the teams along with their seed. (eg. how do teams that rely on 3pt shots fare vs. teams that play very physical defense, and all other permutations)
2. As Locke pointed out, extraordinary events play a large part in games. There was an article in the NY Times on stat analysis where a team official (may have been Houston Rockets' Daryl Morey) lamented a lucky shot-clock-beating 3-pointer by the opposing team, saying those kind of instances significantly alter the game. It'd be interesting to see if some teams are better at creating these lucky instances, or if they're strictly random