Keeper of the Grove is a strong and versatile minion that combines Silence with solid stats, which made the decision to include it in every Druid deck virtually automatic. Whether or not to introduce a source of Silence to a deck should require some decision making, so Keeper of the Grove shouldn’t be a default choice for all Druid decks. Its stats have been changed from 2/4 to 2/2.
Quite a big nerf if you ask me, comparing to neutrals like Spellbreaker or Ironforge Rifleman. Honestly, it's not the body that was the 'problem', it's the versatility. This nerf doesn't take it out of druid decks (mostly), but just nerfs the entire druid class. But it is definitely the most balanced and best nerf, because you can't nerf a choose one effect that easily, which is the sad truth.
I'm just another one of those. You know, those who do things. Things that need to be done by those that do these things in order to do those things that don't do these things themselves. Has the word 'things' lost meaning to you already?