traditionally, the standard 3e D&D combat takes 6 rounds, not 3. It's been fairly well documented, and meshes with my experience.
And doing Full Attack was usually the best option. The exception was usually when the party discovered that wasn't going to work well, so a more extreme method was needed. For instance, disarm or sunder whent he enemy's weapon is particularly dangerous (Mordenkainen's Disjunction ruining your gear dangerous or Vorpal).
Trip or Wrestle when you find it's easier to take him down, than out.
And doing Full Attack was usually the best option. The exception was usually when the party discovered that wasn't going to work well, so a more extreme method was needed. For instance, disarm or sunder whent he enemy's weapon is particularly dangerous (Mordenkainen's Disjunction ruining your gear dangerous or Vorpal).
Trip or Wrestle when you find it's easier to take him down, than out.