I like people who are passionate about something in life.
For many people, life is one drab, dull routine. Wake in the morning, go to work, come back, see TV and go to sleep. They have nothing to look forward to, nothing in their life apart from their family and work.
Some people, on the other hand, have a passion for something other than work. The life of these people is enriched by this love.
May be a hobby, a game or something else. They look forward to spending time on that and enjoy it thoroughly. They look forward to an opportunity to spend time on this.
I strongly believe that this passion actually makes them work better, work smarter and increases their productivity. The mind gets a break from the daily routine and when it gets recharged during the time spent on this activity, it can work much better.
It can be something simple as gardening or a game. Some people love to dance or sing. Others like to read. But there really must be something in life that one should look forward to.