In all honesty, finn's arc with martin is the only arc in adventure time i can say i liked and have no real issues with.

however, i still would've liked to see martin push finn to the point of getting him so worked up that they end up fighting. XD and after thoroughly kicking his ass (maybe even jogging some of martin's repressed memories), finn drops the "i already have a father" line from sam raimi's original spiderman, because i freakin' love that movie and FR, it is very weird how joshua and margaret are never really brought up at any moment in this arc...