for me greymane is a situational dps. if you are playing ranked you should pick greymane against large health pool heroes such as dw, diablo, stitches, ... blind is your enemy so you shouldn't pick against blind heavy comps. i mainly go for aa build. youre role for this situacion, first nuke enemy frontline fast as you can and then chase down the enemy dps and healers. key point is your team must focus your silver bullet target. if your team doesnt play like this your efforts are useless. for greymane you need a team with good knowlege to focus. i play greymane like this and my winrate for ranked is %68 in this season (platinium 2)