At the Performance page of a player, we show the player's overall offensive and defensive performances. The overall performance represents the sum of the performances on each of the underlying action types. So, offensive metrics include the measurement of Passing, Finishing, Crossing, Dribbling, Ball Retention and Offensive Positioning, while defensive metrics are Prevention, Pressing, Recoveries and Defensive Positioning. Check this article for a further explanation on how the Performance of a player is calculated.
This approach means that for a player who offensively contributes a lot on -say- Passing, and contributes little on the other action types, his overall offensive performance would consist for a big part of Passing. Another player could contribute little on passes, but a lot on Finishing and Dribbling. Then the overall offensive performance of this player would mainly consist of cross and dribble contribution. However, both of these players could still have similar overall offensive contribution per 90 minutes. See the table below for an example of this situation.
The fact that a player's overall performance only consists for a small part of a certain action type, does not mean that this player's performance on this action type is poor. It could also be that this type of action simply plays a smaller role in player's (required) contribution to the team. Therefore we always compare a player's performance on each action type with similar players in the same league. Looking at the example above, player B's overall performance consists very little of Crossing and Offensive Positioning. However, this could still mean that this player excels on Dribbling compared to other players in the same position in his league.
Another effect of this approach could be that a player excels at three or four action types, scores low for only two or one action types, and could still be at the bottom of the league on overall performance (offensively or defensively) An explanation for this could be that the overall performance of similar players in the same league consists for a large part of the other two or one action types.