As an old git who starting computer gaming with Pong, it still blows my mind that I can play what feels exactly like a real game of table tennis with my brother who lives 200 miles away.
In the end, it's only table tennis, which isn't (for me) the world's greatest sport, and the AI opponents are never quite at a level where the competition feels even, but it's wonderfully executed and thoroughly enjoyable.
It also hurts when you punch the furniture.