I don't mind the new Graves, but I'm worried.
Right now, if Graves Auto-Attacks at the same time as any other AD Carry with the same amount of Attack Speed he'll probably do 3 while the Enemy does 5. THIS IS FINE. Through his Abilities and Passive and other measures he's still as effective as an AD Carry.
What won't be fine, though, is when Riot nerfs what they've compensated the loss of those Auto-Attack with. Riot can remove Abilities from any AD Carry, but at their core they're still an AD Carry who can build Attack Speed, Damage and Crit and go melt people. If Riot did that to Graves, he wouldn't actually be able to function as a Normal AD Carry.
But like I said, I'm content with Graves being able to go around dealing 5 Attacks worth of Damage in 3 Attacks. He's meant to be a bursty AD Carry. But if and when Riot decides that they don't like that play pattern on him, please just revert him to Season 5 Graves.