skeptic said:2 : In gamist play, should combat with opponents who can't win be played out ? I would say no, just quickly describe how the wizard destroyed the goblins with a huge fireball. However, sometimes players like to throw lots of dice to see how powerful their character are, let them do it once in a while.
In 1e one always played them out because they only took a few minutes, resulted in resource attrition, and so would be relevant to tougher fights later on. The main reason not to play them out in 3e is just that they often take so darn long; I once spent an entire session on a battle between 13th level PCs and several dozen Duergar of 1st-5th level. It was kinda interesting but 4 hours was way too long for any fight, never mind one where the enemy have no real chance to seriously hurt the PCs.