DIAGLO: I disagree. This is a very silly discussion.
Lets try this again.
The point is someone was telling me "your campaign isn't good because of anything to do with the 3e rules", and I'm saying yes it is, and citing the ways in which those rules have really mattered. Thats not an opinion, thats a factual account- and not just a fact for me- but a plain fact. Not only that, but how would anyone who hasn't seen my camapign or played in it even know?
If you say "OD&D is the one true game" thats obviously an opinion, and it is easily discarded becase who wants to argue over preferences? If you say "the OD&D rules made my camapign great by providing X, Y, and Z"- that actually means something. Nobody can really dispute that, except maybe your players. And still, we would then have to privately evaluate whats good about X, Y, or Z.
If we were talking about cars it would be easier. The 1973 Ford Galaxie 500 is a great car. You could call it the one true car or your favorite car. Nobody would have anything to say about it. Some classic car type people would even agree.
If I say "my new car is better than the previous models because it is faster, more reliable and easier to find parts for than the others. Also, it has air conditioning." thats more than just an opinion. Because the facts remain: it IS faster, it IS more reliable, it IS easier to find parts for. There's no opinion involved here.
If someone comes up and says "your car isn't better because it's just faster, more reliable, and you can buy parts for it and so on. Thats just an opinion.."
Well, no. It's not an opinion. That person would just be wrong.