Cenarius is designed to be a support that really wants to be in a "Battlecruiser" comp - where you want to really make one character, like Illidan, become an unstoppable and unbeatable force.If the holder of Horn of Cenarius dies, his team is in trouble because most of his power comes from the Horn, so when that Hero dies, it's like losing 1.5 Heroes.Cenarius's shield is much more powerful than his straight up healing - and because of that, he cannot sustain really long team 5v5 teamfights since the shield won't last forever, his healing isn't strong, and he'll run out of mana quicker than most supports; this is specifically true before he gets to level 10, where his ultimates greatly increase his capacity for healing.His team should focus on letting the holder of the Horn gang up on stranded enemies - the Horn will make a strong 1v1 fighter out of any character... except maybe Abathur. But a Symbioted and Horned character is one unkillable fighting machine.Cenarius is very mobile but outside of being quick, he has no escapes. He can't teleport, slide, or jump anywhere. If he becomes trapped, he can be in trouble.He is also a strong solo laner. His abilities all can target minions, so he can Tree Guard one to summon a Treant that will destroy opposing waves or Healing Touch a catapult to make it survive longer and deal more damage. And if he holder of the Horn is another lane, it's like Cenarius is there the entire time healing them.Cenarius is a melee hero with pretty high health for a support Hero, has a fairly low mana pool, high cool downs, and one of the lowest damaging autoattacks in the game. You have to be less careful about his positioning and more careful of what you're doing with him - you need to be frugal with when and who you target your spells with and be very aware of who has your Horn. Cenarius requires a lot of planning and teamwork to get the most out of him., all the numbers all obviously need to be tweaked. If something is too powerful, it probably is. If something is too weak, it probably is. I haven't played with him, so I don't know exactly what everything should be - I just know how I want him to be played.