How to evaluate listing agents - superstars vs mediocre

[Sonia T.]

Hello,

How does one evaluate a real estate agent/broker?

Is it reasonable to ask for a MLS printout with the following:
1) average days on market;
2) percentage removed from market without selling;
3) How close to listing price the properties sold at;
4) How few "concessions" were given by the seller.

Also, can they print out the statistics of their competitors? Any other questions I should be asking?

Thank you!