What are your favorite Board Games?

Like the title! For someone getting into board games, what would you recommend? Bonus points if it is or can be played cooperatively, with 2 players, and double bonus points if it has a sci-fi theme (like, grand sci-fi), though the previous points are more important.

What do you like to play? Arcs and Earthborne Rangers both look cool to me, but wanted to ask here too! Anyone have experience with those two?