More than 300 matches later with Cenarius: my small review
First of all, my experience is based on these 10 days and around 300 matches with Cenarius across various PvE and PvP tests (by the way, I played Golemagg with him, pushing three towers at once).
PvE: He is incredibly strong, and his "double" healing talent supports the team effortlessly. He stops hordes with his roots and is also tough to kill... fully approved.
PvP: He suffers from some HUGE weaknesses (flying units destroy him, and Tyrion crushes him in direct duels). Additionally, his "familiars" are currently few in number, making his 20% bonus almost useless. However, if you can survive the early game, he becomes unstoppable; considering this (and my team setup), the bog creature has a 30% healing bonus as a talent, AoW speaks for itself, and the rest you already know. His casting cost is high on average (even though it was two weeks with double energy), so in a normal situation, get used to playing slowly.
Overall I give to him a solid 7/10, not need any nerf because is perfectly balanced and fun to play, if you accept to have some weakness and to be slow.
For any questios, feel free to ask me.
Yes, I m a spender, if this let feel you better, feel free to insult me on comment but the purpose of the post is to help newer players or players who want to start to push hard with him..and my 100 euro spent for this season worth every euro caus I play this game 6 hours a day and it is my only game so..I can do it