Earlier quoted context omitted.
in dota the tactics is to do with the execution of abilities, often times in coordination with other agents in execution of their abilities to get combo effects while adapting to the situation as it unravels.
As an avid dota player I wouldn't agree with your characterization that 70% of dota 2 is your definition of tactics. What I've noticed differentiates player MMR the most is the strategy applied to each context. It's rarely the execution that's the problem as you can gain such overwhelming advantages through strategy.
What's your MMR, out of curiosity?