I find it rather unrealistic. Too many upsets. And I noticed in every simulation I tried, the Magic upset the Bulls...but then again one scenario had the Grizzlies going to the finals. But it is fun to play around with...
I did the Custom and had the Bulls as the 1 Vs. the Pacers...then filled in the C's as 2, Heat as 3, Magic as 4....then clicked for automatic finish...and got the Bulls winning...
Personally, I think this thing is the most accurate predictor in the world.