Well, I've been playing for 3 days and I think this is the mayor problem I have found (beside the strange performance issue on some servers).
Grass should be rendered until 500m or a solution to make players less visible on the blurred ground. Also, when shadows are turned off, it's very easy to spot enemies, this is a real advantage/disadvantage. I think the performance limiting features lie elsewhere, so hardcoding grass until 500m and shadows (even with less detail if necessary) would make the game much more enjoyable. Lying under a bush beside a tree and surrounded by grass makes you think you are in cover, but the fact is that the enemy most probably is seeing your body lying on a bright blurry texture, totally exposed. This is a fun killer for me. The ground textures could also need some work, but I believe grass and shadows are at least as necessary. Change this, and we have got a killer game (it's already a lot of fun)