Objectives>everything else AND knowing how to close out the game. I'm constantly getting teammates that try to avoid end fights because they'd rather split push or "go for baron".
Frankly it's quite annoying when you sit there and kill the strongest enemy opponent that could be anyone. Maybe your team is all AD and they have
that you killed. Maybe their team has
(blue) and that you've killed when all your teammates are squishy.
The other problem is being at the mercy of your teammates, when you feel you have a clear picture of what needs to be done next. If their inhibs are exposed and most of them are dead, why not get inhibs instead of baron? If their inhibs are down. Why not get baron? But no, you still have people that prefer to split push, clear more jungle champs for the $$$$$$$$$$$ and go for something stupid like a mountain drake after you'be pretty much cleared all structures.
follow teammates around? Well yeah sure, but there's always going to be that one straggler that will go push bot or clear jungle camps when it's time to team fight and win the game.