I've been thinking the same thing a lot lately. Weathering is the thing nowadays in ww1 a/c modeling! There have been a lot of heavily weathered models on the net lately. Some of them built and weathered in such a skilled and masterfully way, that I can only envy the modelers and I have to confess that I'll probably never be able to do anything alike. But still... They are exaggerated! Especially I'd be careful to weather the wings. In old photos they are almost always in good condition. It is not unusual to see shiny wings with the struts reflecting on them even in planes with a bit ragged fuselage.
Most of all I think that even tough weathering can give a very very nice look to the model, and those who like to do it should do it and even over do it if they want, but it should never ever be a MUST! I have understood that in the world of the military vehicle modelers the worst have already happened: If you go to a competition with a tank model representing something fresh from the factory, you'll be laughed out!
I'm afraid that judges of the modeling competitions here in Finland are a bit of 'some weathering is a MUST' guys, tho over weathering has been criticized lately.