If I may, I'd like to throw in my two cents worth. I have judged armor in both regional and local model shows since the mid '90s. I don't do it a lot, and I freely admit I still need some more experience in the field, but here are some observations and personal philosphies:
1. I don't judge by myself, and I don't think there should be only one judge on one model entry. I have always judged with at least two individuals. This allows for a lot of discussion, lessens the chance of overlooking a problem, and tends to prevent favoritism.
2. When I come upon a model I know a friend of mine has built, I will not judge it. Likewise, I will not judge a category I am entered in. Some call this conflict of interest; others, abstaining from the appearance of evil. If this is not written down somewhere, it ought to be.
3. If I don't know, I will ask. The contests I have been involved in have always had a "supervisory" judge for that section (armor, aircraft, etc.)--who always answers to the senior judge. If a question comes up regarding a particular piece I or my colleagues are unfamiliar with, I get a second opinion.
4. I have found armor judging to be quite objective, contrary to some of the subjective statements made in this post. In 1993, I attended a judges meeting at the IPMS Nationals (I went, not to judge, but to gain knowledge that would benefit me in future competitions). Walt Fink was the head judge, and he made a statement that has rung true for me. He said that most of the models on the tables could be disqualified (in keeping with IPMS rules) because of flaws in basic kit construction. I have found this to be true in 100% of the kits I've judged. We never get to the point of asking about color, camouflage, extra detail sets, conversions, or the like. The armor piece with the fewest mistakes in basic construction usually wins its category. It's sad to see an individual enter a Revellogramiya tank with two sets of Eduaber PE sets in place with a flawless paint scheme that took 1,000 hours to construct, and find visible seams along the barrel, ejector pin marks, tracks that don't sit parallel to each other, roadwheels that don't all touch the tracks as they should, silvered decals, shiny glue "splots", see-through engine and ventilation compartments, and the list goes on and on. The argument has and could continue to be made that judging should be based on the work done, but I thought we were trying to recreate, at least somewhat artistically, a piece of history. A kit shouldn't look like a pre-assembled Mattell kiddyblaster that just came off the shelf from Wal-Mart. Fortunately for all, the kit with the least amount of glaring errors usually places; and I think that's good.
5. Those individuals and their kits that don't win need to be handled with all tact and sensitivity when providing constructive criticism. I saw a dear friend of mine defuse a potential shouting match that way. And the entrant later came back to another competition and effectively cleaned house with awards. Our goal should be to make potential winners from everyone. It doesn't look good for the hobby when the same people win year in and year out. Someone isn't doing their job to motivate, encourage, and spark new and renewed interest. I actually think competition helps us build better models. Competition may not be for everyone, but it has its place; it certainly helps me.
6. Lastly, a pet peeve: I can't stand judges who think they know it all. At a nationals event, I had the experience of listening to two judges discuss a particular diorama entry. They spoke loudly to ensure those around them were duly impressed with their knowledge of the subject matter. The funny thing was that they didn't have a clue what they were talking about. It was enough to make me sick. Were they being completely subjective about the entry? Absolutely. Could they have judged from a more objective standpoint? Totally.
7. OK, I'm finished. Please feel free to flame away if you wish. I just wanted to give one judge's opinion, however skewed you may find it.
Gip Winecoff