Im mostly positive about the change, mainly because I'm glad to know for sure that Niantic is willing to balance CP.
As for the actual changes, it's exciting to see certain Pokemon go up, dissappointing to see others go down, but I'm not sure of my thoughts on how this will effect the overall gym defender meta though.
I feel like many of the Pokemon who got buffed didnt get buffed enough to hang in the gym defender game. And certain Pokemon that were closer to being up there got nerfed. Rhydon will probably be the new Arcanine, just beefier and still easily taken out by Vapes. I'd hope at some point, Vape gets nerfed a bit and Blastoise becomes the superior one, considering it's MUCH harder to get.
I'm mostly thinking about the gym defender meta because I think the easist way to make this game a lot more interesting right now is to have more viable defenders. I'm really happy about Machoke, Gengar, and Alakazam's buffs. I really wish the Nidos and faries got buffed up to that level, but they seemed to have gotten nerfes for some reason. Same with Vileplume and Victribel. Hmm.
I honestly dont the buffing already strong pokemon as they did is that big of a deal. I'm more concerned with how they nerfed many Pokes that could have used buffs.