After hearing that apparently Destiny 2 might be delayed I wondered what has Activision done for gaming as a whole and it's history? Some of it's most notable IPs: Guitar Hero and Tony Hawk have pretty much been run into the ground. It could be said that it helped gaming become mainstream with the popularity of Call of Duty, but what else?
They were the first independent third party
They were the first company to push for people who work on games to be credited for their work
It's important to remember that Activision is a very old company. Not Nintendo-old, of course, but they were there from pretty much the start.