Have you ever had trouble doing this? we shouldn't really have to as its our interest but in life people close to us like say friends, partners or siblings may want to know what they are missing out on. I personally have never known what to show these people to explain what's so cool about it. if I was say for example a star wars fanatic I could easily show them the original trilogy (if they haven't seen them already) as all but the most hateful troll type even if they didn't like it themselves could at least acknowledge why it has an appeal to others. I am a huge than of transformers but Personally I don't know what to show people to explain its appeal to others as g1 is loveable but has a tendency to break under the weight of adult logic, beast wars is class but its graphics can look a bit rough by today's standards. the unicron trilogy (by my opinion) is a bit too average to show off to anyone. I would say animated or prime out of the tv shows would stand up best to the eyes of the non fans. As for the comics its hard to say what to recommend to others as alot of the best comics tend to be the later firman wrote bits of marvel g1 or the good bits of idw or dreamwave. the problem with recommending these comics like say for example last stand of the wreckers would be that they are so drenched in transformers mythology and homages that its importance might fall flat on a non fan. as for the films the first one is an ok start but I went to see revenge of the fallen with my girlfriend and some of my friends who are non fans that was one of the most embarrassing days of my life. How would you explain the appeal of a franchise in the eyes of the rest of society is there just to sell toys children to non fans?