Yeah it's odd when you look back at your own work. Some filmmakers don't look back at their work at all. I look at my work a lot actually. I feel like I learned something while looking at stuff I've done in terms of what I'm going to do in the future mistakes I've made and things at work or what have you.
True wisdom is less presuming than folly. The wise man doubteth often and changeth his mind the fool is obstinate and doubteth not he knoweth all things but his own ignorance.