Bizarre color choices, intentionally limited palette
This texture pack contains some bizarre color choices, in particular regarding wood:
Apple tree stems are yellow and dark red
Jungle tree stems are light red and dark red
Pine tree stems are red and gray.
Edit: The colors are intentionally setup like that. According to the author, this texture pack is a joke and intentionally made to look bad. The following criticism does not apply anymore since the author fixed it, but I am keeping it here for posterity, since the discussion below this comment makes little sense without the context:
The worst color choice though is that plantlike grass nodes have the exact same color as the top of dirt-with-grass nodes on which they usually grow, making them almost invisible. That detail alone makes this texture pack unsuitable for gameplay in my opinion, at least in biomes that contain plantlike grass nodes.