That's all I used to play too, grim hunting and having to do all the 100 3v3 wins made me a better player (I'm not great by pvp'er standards) but much better than before. Personally I'd rather experience a wide range of stuff then focus on being the best at one part. Generalist vs specialist. May be why lots of max grim players aren't the best players at certain activities but they are geared up, leveled up and can hold their own at everything - most of them at least,

Control is the shit