I think we can all agree that any break we can get from the typical Snova rainbow decks and the standard rush decks would be welcome. In my opinion, gravity is quite an underused mark for both PvP and PvE. This new card could at least be a step in a new direction, and there was no reason to nerf it (as far as I'm concerned).
About the stall decks. I saw alot of people bring alot of good arguements to the table, so I'll leave it at that. And like you already said: Overdrive isn't monotone, it's versatile! (you know you said that! And yes I still love you somehow...)