[ART] Texturing a custom terrain

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However, whatever texture I'm assigning it, the result looks really bad in game, even if it looks great in maya.

Looking at the screenshots, I'd say it looks pretty much the same, only that in game you're much closer to the terrain than in Maya's viewport, so you see the low texture resolution. Or rather, you see that the scaling of the texture doesn't fit the scale of the mesh, with one blade of grass being half the size of your character Therefore, I conclude that scaling up the uv coordinates of your terrain mesh, so that the texture gets repeated more often, should help.