The problem with Jango, beyond being scripted to die there, is that he went in with a full assault and used no tactics. My non-jedi would lay several wonderful mines, keep a thermal detonator hand or five handy, and create a nice little trap for the Jedi or Sith.
If Jango used his rocket back and rained various deadly grenades around the Jedis instead of being stupid and go straight in up front confrontation it would be Windu done for the count.