I'm not making a stand for CrossFit, but the globo gym "form police" argument is weak.
As far as the sloppy snatches go- if your form sucks, you're probably not moving anywhere near close to maximal weight. If you are moving maximal weight and your form breaks down, the barbell usually (like 99.95% of the time) falls.
As for round back deadlifts- this is a real, legitimate technique. Don't think so? Watch Benedikt Magnusson pull his 1,015 raw world record- or watch any other 800+ conventional deadlifter,you will be hard pressed to find one with good globo gym form.
The flat or arched back deadlift is more a clean pull than it is a deadlift. The connective tissue in your back is the strongest anywhere in your body. Injuries are more a product of an untrained athlete than they are of "improper" form.
ETA- Bad deadlift form, Dave Hansen, Eric Lilliebridge, Benedikt Magnusson- three awesome deadlifters... with round backs.