I will comment on my faults:
1. not letting backcast straighten
2. i get a wobble in the line on the forward cast.'
3. not a tight enough loop
I've been fly fishing for 12 years and just recently decided to work on my casting since i never had a need for distance.
Once I started to learn about good casting, my casting has gone to hell. I used to cast a good distance with my old 8 wt, now i have problems with 50 ft. on a new, good rod.