Right now the joke of the reworks is Maokai's ult. I know he is a problem with the full AP build, but we aren't here to talk about that. The best way to "buff" maokai's ult is not to change speed or width etc, but make it global with the same speed. It would make for the most hilarious moments in league ever. 
or yet learn to use it in other ways such as a bumper in engages or yet come in from behind (as full tank) and ult them from behind to and watch them
a. run away from it into your team b. move into it to get less of a root but then deal with you c. scatter and get picked off
Maokai's ult is fine, just understand that it isn't a tool used to engage. It's for what comes after the engage (Twisted advance) to lock down that 9/0 Darius or to peel for your carries.
It would be far too strong, although it would be really fun.
Too strong because you could just ult behind them in a teamfight and they're fucked.
