I've observed that class action lawsuits usually benefit the defendant greatly in that the nature of class action suits is that they deprive any persons with standing from all future legal actions on a matter. Sometimes they get nothing as part of a settlement, other parts they receive some token coupon that usually has restrictions to make it useless. In no case is the opinion of the members of the class taken into consideration, nor do they have any right to object to settlements, nor are they normally informed of the settlement until after it has taken place.
In effect, it's a similar protection scheme to how Congress passed a law banning the filing of lawsuits against BP in return for them paying a fine for oil spillage that is vastly below the cost of fixing the damage.
Many actions that are labelled as "settlements" or "fines" are actually bribes paid to the legal system in return for total immunity from future lawsuits.