Out of general curiosity, what would be considered some of the simple or difficult martial arts to study in everyones opinion. From my experience, something like shotokan or tae kwon do are pretty straight forward despite their hard to perfect kicks. In terms of difficulty i would have to imagine that aikido or certain forms of jujitsu are more difficult to perform.
In my opinion, some of the older chinese martial arts would probably rank up there. They tend to be complex not only in technique but philosophies as well.
