Morgoth, that's probably because we've got used to those weathered skins on IL-2. Check Oleg's news topic, it has some pictures showing how weathering will work.
It will look better after some sorties, don't worry
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Plus, if you don't like the defaults, you can make your own skins, as we're used to do on IL-2.
And, at last, it's not even beta, and if I got it right, the graphics are going to look way better than now.