I've always found it interesting to see other people's characters, especially ones that have a lot of game sessions behind them. Obviously, power levels between campaigns are going to vary wildly and YGMV, but I find it fascinating because it not only reveals a lot about play style, but it also helps me see how game systems are put into practice, how the characters relate to the greater world, and where the game system might potentially break down. No one exploits a system like a well motivated