Hold on there. 3s and 3b, 1b, and LF is fine. They only get around 20 chances each a season.
3b has the same chance for an x result as cf and c, Mathew. They'll have closer to 60 x chances than 20 per season. And fielding is the wildest in terms of varying results of all the stats, so you have to be careful generalizing. Bad outfielder results are so much more serious than bad infield results, this is one of the hardest areas of the game to generalize about.
After 144 games, these are the x chances by position of one of my teams:
c 81
1b 45
2b 133
3b 53
ss 164
lf 56
cf 60
rf 50
Small samples, like fielding, lead to big variations in outcomes from season to season.
Hank