I firmly believe more exposure to marginal weather conditions during training would be beneficial. I have a flight that was 0.6 during my commercial training where my instructor and I blasted off into crap weather. It was something completely new for me and something I didn't experience again until I had a load of punters down the back...I did it through ignorance rather than anything else, simply because I didn't know what was in store for me. To read a TAF is one thing. To see what that actually means is something completely different. Happily my passengers seemed none the wiser when their very pale pilot opened the door for them at their destination.
If my instructor had scared the **** out of me during TRAINING by flying in crap conditions I very much doubt I would have done something that stupid on a charter but we'll never know for sure. Certainly couldn't have hurt.