You can see a summary screen with the player's attributes - I just do the maths in my head (on either PC or iDevice). E.g. guy needs to be averaging 80 for next star, he has 80.8 attack, 78.6 Defence and 79.6 Phys - subtract the 0.8 from attack, add 0.4 of it so Phys and 0.4 to Defence, and that gives you 80.0, 80.0 and 79.0, meaning you're 5 cones away. Simples.