Wife picked up Black Ops 3 for me while I was out Friday. Put some time into multiplayer on Saturday. The free-running momentum movement system is really fun compared to the AW mess that was boost jumping. They definitely took elements from multiple games, it seems, but I welcome it. If they aren't going to go back to a solid shooter and have to have lasers and fancy weapons, might as well give players an "ultimate" meter and a crazy ability.
Gameplay is very entertaining. Some people are impossible to kill and can really ruin a match, but you'll eventually find a good lobby. The only pitfall so far was just that it has normal connectivity issues being the first few days. There's a lot more challenges to earn and zombies looks mildly entertaining, usually not something I'm into.
It will be tough trying to juggle whether to put time into Black Ops or Fallout.