I guess you're right... not too inconsistent to be a #1 scorer...
Playoffs...
Game 1 - 35% FG%
Game 2 - 58% FG%
Game 3 - 39% FG%
Game 4 - 46% FG% - Hurt hamstring during game
Game 5 - 29% FG%
Game 6 - 29% FG%
Game 7 - 30% FG%
FG% isn't a particularly accurate way to judge consistency. Lists points per possession used for all his games.
A possession is when you shoot, get to the line, or turn the ball over:
Game 1: 20 points, 21 possessions
Game 2: 42 points, 28 possessions
Game 3: 15 points, 17 possessions
Game 4: 22 points, 25 possessions
Game 5: 26 points, 28 possessions
Game 6: 12 points, 18 possessions
Game 7: 33 points, 32 possessions
Total: 170 points, 169 possessions
He had one game where he was ultra efficient, one game where he was terribly inefficient, and five games where he was close to 1:1. He played with an injury which notably hampered him for three of the seven games. His scoring consistency was pretty his low water marks were 12 points and 15 points.
Let's look at Paul Pierce:
Game 1: 24 points, 28 possessions
Game 2: 18 points, 24 possessions
Game 3: 24 points, 17 possessions
Game 4: 29 points, 34 possessions
Game 5: 26 points, 26 possessions
Game 6: 22 points, 22 possessions
Game 7: 20 points, 24 possessions
Total: 163 points, 175
He had 1 game where he was ultra efficient, 4 gamers where he was moderately inefficient, and two games where he was 1:1, His point production was very consistent even if his scoring efficiency wasn't.
Let's look at Ray Allen:
Game 1: 4 points, 14 possessions
Game 2: 30 points, 21 possessions
Game 3: 18 points, 15 possessions
Game 4: 28 points, 23 possessions
Game 5: 10 points, 11 possessions
Game 6: 51 points, 38 possessions
Game 7: 23 points, 18 possessions
Total: 165 points, 140 possessions
Allen was great, outside of his game 1, he was basically awesome. He was consistently efficient, having very good efficiency in 5 of 7 games, 1 super dud, and 1 game where he was average. Of course his points were all over the board, as he has 2 very low point games.
Let's look at Derrick Rose:
Game 1: 36 points, 30 possessions
Game 2: 10 points, 13 possessions
Game 3: 9 points, 22 possessions
Game 4: 23 points, 26 possessions
Game 5: 14 points, 26 possessions
Game 6: 28 points, 33 possessions
Game 7: 18 points, 21 possessions
Total: 138 points, 171 possessions
Basically, his efficiency was god awful for most of the series with only one game of good efficiency all series. His scoring consistency was also pretty bad with games of 9, 10, and 14 points while he scored 36 and 28 in other games.
Let's look at John Salmons
Game 1: 12 points, 17 possessions
Game 2: 17 points, 21 possessions
Game 3: 14 points, 17 possessions
Game 4: 20 points, 19 possessions
Game 5: 17 points, 19 possessions
Game 6: 35 points, 26 possessions
Game 7: 12 points, 17 possessions
Total: 127 points, 136 possessions
Salmons played through a sore groin which may have effected his play (though he did not look as visibly hobbled as Ben after the hamstring injury). His efficiency was basically poor for the whole series except for game 6, his total point consistency was basically poor too as he had duds in three games and lower games two more with only 17 points.