In my RT league, Troy Glaus, he of 5 MLB innings at SS this season, has been BY FAR the best defensive full-time SS in the league, committing just 3 errors in 59 games.

My Jeff Bagwell has committed 14 errors in 65 PB games : He's got 9 in 143 ML games.
And my Greg Maddux has an era of 5.
Of course, I have some players playing well above their "capabilities" too, such as Tom Goodwin with 7HR, vs. only 6 in twice as many MLB games.

On a whim, I played the demo with Pokey Reese at catcher. He played one game without an issue, no E's, and no passed balls. The next game he had 6 through 6 innings.

Bobby Bonilla (for reasons I can't fathom) was called by the ROBOT to play SS when I had an injury to my starter. He played 7.2 and did not commit an error. The ROBOT then chose Paul Konerko (silly ROBOT) to start the next game, and he committed 2. I know the game tries to make up for things my reducing a players "range" (Bonilla had 0 assists, meaning he got to nothing) and such..

I suppose if you were to think of "reality", any ML ballplayer, if put at SS, would make the play 75-80% of the time. He may not get to much, and he may not turn most DP's, but he can still pick up a grounder and throw to 1st base.
If you assume there is a 3/4 chance that he will make the play, I suppose it's feasable that a mathematical simulator could come up with a game worth of 0 errors, depending on the chances.
I looked up Clark, and he had 6 assists in 9 innings. I guess that's a darn good day, so I can see how that would tick me off too. Getting 6 assists means he's got a lot of range compared to average.

In your league, you had a recent no hitter.
The All-Star that tossed that gem : Julio Santana !

Look him up and try to figger out how in the heck HE can toss a no-no!
If that's not an indicator of how randomness can lean all one way, I don't know what is !

Not really being a programmer, I can't imagine the difficulty in trying to develop a game that is "realistic" but still hold on to a "randomness" that it needs to make this interesting. I suppose there are always bugs & issues that need to be addressed, but you could say the same for Microsoft Windows.

Regardless of the quirks, I still applaud the PB staff for creating a really fun baseball environment.