There are many different but equally valid reasons for studying any martial art, such as for self defence, for spiritual growth or enlightenment, for general physical health, for self-confidence and more. Different martial arts, and even different styles within a particular martial art, emphasise different aspects. Hence 'better' really depends on what it is you want out of a martial art. This can only be answered by the individual asking the question. An alternative way to answer this question is to simply say, 'No, Aikido is not 'better' or 'worse' than any other martial art.
Trainees ought to endeavor to observe proper etiquette at all times.
It is proper to bow when entering and leaving the dojo, and when coming onto and leaving the mat. Click here for information on dojo etiquette. The only way to advance in aikido is through regular and continued training. Attendance is not mandatory, but keep in mind that in order to improve in aikido, one probably needs to practice at least twice a week. Your training is your own responsibility.