Some of the aspects of aikido that I dislike.
1. Egotism-If u don't believe it exists in your dojo, you've taken to many hits to the head. I can't speak for all schools of the art but at my dojo we definitely have some who believe their Elvis (I know, he practiced Karate, but go along with the analogy).
2. Lack of competition- I think this is something that needs to change.
3. This "idea" that aikido is a samurai art and is therefore at the top in the heap in the martial arts. Bull@#$%