Stats can be misleading but not always. Pass completion is the hardest to form any conclusions on really, we can both agree on that. But certain ones like Key passes, aerial duels won/lost, chance conversion; show how effective a player is at specific areas. About their PL XI: tbf, stats won't show you all the times Evra falls asleep and allows his man to ghost past. But he's always present in attack, creating chances and scoring a few, which help his rating. As for Gerrard, he has 4 goals and 6 assists in the league, as well as 2.5 tackles and 2.5 key passes a game. Statistically he's doing a great job.