The concept of the tank-heal-damage triad in your typical MMO, including SWTOR, is so easy that a 6-year-old can understand it. It does make you wonder then, why so many people you come across in game seem to have issues with this very basic concept.
Anyway, we stumbled across this very cute blog by Jasper, a 6-year old SWTOR fan. This kid needs to meet up with my 5-year-old (soon to be 6) because I think they could really be pals. I also have a Lego/Star Wars fan in my house and this looks exactly like something my two boys would do. Both gamer fans, former WoW players and huge collectors of Lego sets, why not use the very popular toy to explain this gaming concept?