So hes good to take out Valla and Nova basically

Can take out Li Ming, jaina, KT as well. It's all about timing.

I mean, yea, if Greymane tries to 1v1 a Li-Ming who built into her teleport line of talents, and she's up a talent on him, she will probably obliterate him. But if he leaps on her after she's blown her orb in a team fight he has a pretty good chance of melting her in under 2 seconds.

Very true and they are important but i mean basically the only time i could see someone use him is in hero league

He gets picked quite a bit in pro play. I watched a few of the more recent tourney games with like Cloud 9 and stuff and they pick a bit differently than your typical 5 strangers HL game.

Lots of Stitches, lots of Greymane, lots of Monk.

I think he does better when he has a team who can commit to ensuring his dives aren't a suicide mission. Like a solid Uther/Monk who is in voice comm with him.

I think he is probably in the top 15 heroes in the game. His ability to spec into his grenade ranged damage and double as a back-line-poke hero is pretty neat, too. I personally don't own him but I've seen some pretty well piloted Greymane's absolutely take control of a game.