My (by far) most experienced player is at the same time one of the worst shooters (despite his brilliant skills) on my team - at the moment I think that experience is overrated a lot by many managers.
Individual stats don't exist in a vacuum, they are conditional on the rest of your team and the opposition.
There are multiple scenarios why a brilliant shooter can post poor shooting percentages. Here are some examples:
* He plays a position where the opposition usually stacks its best defense. That would typically be SG for outside players.
* He has poor passing skills, making him shoot more, thereby driving down the percentage, since he may take bad shots instead of passing the ball.
* He is the _only_ good shooter on your team, making opposing defenses collapse on him, thereby decreasing the quality of his shots.
* You're facing some very good defensive teams, and/or choose tactics that that play away from that particular guy's strength.
It could be any, and is likely a combination of multiple of these factors. It should be noted that the way the average player's skills are calibrated these days, outside shooting percentages tend to be low across the board (which is another way to say people tend to train more OD than JR).
The game is complex. Don't underestimate its complexity when drawing conclusions.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."