There are already topics related to your question, for instance
- What are the first things you do with a new Lubuntu installation?
- What makes you use Lubuntu in this day and age?
- Why I choose Lubuntu
and perhaps some others.
Since last September I use Lubuntu for all purposes - mainly internet surfing and only a bit of office works because I am in retirement - except playing MS Flight Simulator X and some old point-and-click games. For these my old Win7-PC is suited much better.
Out of nostalgia, my favorite game is LBreakoutHD, an old-fashioned ball-and-paddle-game which I had installed by using Discover. You can see which games you might like by clicking on category ‘Games’ in the GUI of Discover.