I should clarify. By LeBron's standards, he's been fairly mediocre.
25/10/7 looks great by itself, but then consider he's playing 43 minutes a game, which inflates those stats a bit. He's only shooting 45%, and he's turning the ball over five times a game. All of the metrics that try to encapsulate performance rate him way below his standards: 22 PER, .117 WS/48, and a 5.8 Box Plus Minus. His career averages in the playoffs are 27.5, .238, and 10.2.
Again, poor wording originally. LeBron has been good compared to most, but he's playing way beneath his capability.