What I found 'turned me off' about Aikido for a while before I started studying it was my best friend touting its superiority
Common sense seems to suggest that constant touting of ones superiority is a mask for some kind of unconscious inferiority or inadequacy. Moreover, as harmless as it may seem, storys about Aikidos superiority are quite poisonous to the martial arts as a whole. The average Aikidoka has 1001 ways of subtly, or obviously undermining other martial practitioners with unusual anecdotes, philosophical postulations etc. Unfortunately and ironically, Aikido is not a superior martial art either in terms of self defence or philosophically. If a person believes it is the best they have not seen enough martial arts.