I cannot stress how much i agree with this enough.
Progression is usually based on 3 things:
The attitude of the raid(how seriously you take it)
The skill of the raid
How many hours you guys raid
There are guild that are serious and raid 16 hours a week but are not as skilled. They may have the same or worse progression as a serious 9-10 hour a week guild that are much more skilled.
Casual =/= bad
hardcore =/= good