Excellent points. I applaud the judge for this decision.
The attorneys for each party are highly sophisticated, having litigated many of these cases before. They're in the best position (better than the judge) to know the strengths and weaknesses of their respective cases and what their respective clients want. And finally, although it's been rightly pointed out that while plaintiffs' counsel may have somewhat different motivations than their clients, they still basically want every dollar they can get out of apple et al, just like their clients.
So while I agree that the judge has an obligation to make sure the settlement isn't totally hosing either party, I don't think it's appropriate for her to substitute her judgment for the attorneys unless they're completely off the rails -- and I just can't see how a 15% variance from a prior case is that "unreasonable." Maybe the award in that case was on the high side. Maybe the plaintiffs in this case don't feel good about their case. Maybe they just want it over quickly. Or maybe the defense attorneys in this case just did a better job negotiating than the last set of defense attorneys.
The judge seems to have two assumptions here: first is that the prior case necessarily must define the amount in this case, despite the fact that even similar cases often resolve very differently, and second that -- assuming that for some reason that prior case must control what's "reasonable" in this case -- a 15% variance from that case is so extreme as to be outside that range of reasonableness. I don't agree with either assumption.