You have to waste 3 Global Cooldowns to do very mediocre damage even while solar eclipsed.
But wait they provide a slow! haha useless against range and caster classes, and meele classes let's analyze this:
warrior = oh no he just used 3GC spent time placing the shrooms to strategically slow me down. I know I'll just charge him rendering his 3 gc usage useless with one GC.
DK= same thing but uses deathgrip
Kitty =wild charge or displacer beast
rouge= sha-sha-sha-SHADOW STEP SON!!!
Paladins = sure Im slowed down but I can still nuke him from far away while I reach him. or just use speed of light.
shamans = Well they have their own problems.
Conclusion mushrooms current state makes them next to useless in PVP other than strategically placing them to wild charge to them later. They really need to be re-worked or improved somehow because the concept seems fun but it just isn't working right now.
Maybe make them absorb some of the damage the druid takes I don't know just getting a brainstorm rolling. Leave some feed back