One of the many hats I wear at Miller & Zois is that of our in-office appellate specialist. I handle all of our law firm’s personal injury cases that wind up being appealed, and that I accept referrals (from other lawyers only) to handle civil appeals of all types.
One thing I see over and over is briefs from the other side that make the ill-advised choice to attack the trial judge or trial counsel. And I don’t mean with reasoned legal arguments, I mean things that are over-the-top, like allegations that the judge was biased, or ad hominem attacks on the opposing party or their counsel. There are a lot of things wrong with doing that, but the two main ones are 1) it’s unprofessional and 2) making yourself look like a jerk isn’t very persuasive.
If you handle appeals on a regular basis, you should take a look at “Professionalism On Appeal: The Good, The Bad and the Ugly”, an article by Howard J. Bashman, a Philadelphia-area appellate specialist. I think he sums it up nicely by saying: “Indeed, expressing animosity toward opposing counsel on appeal, or toward the trial judge, usually proves to be counterproductive rather than an effective strategy for victory.”