Splatoon. The design, the music, the art, the gameplay and the idea was executed so well.

Read a lot, cite sources and explain thouroughly what you think.

I mostly use the last method. Basically, you want to make sure that the other person understands fully what you mean. You can use examples and anecdotes as well.

Training yourself in philosophy also helps, as it makes sure you argument well what you want to say.