Maybe somes suggestions:
- There enough of medieval theme or magic world...
- Futuristic is great because you can create anything you want...
- A good and realistic terrain
- Sound! Sound make it better!
- Good story, and random action make it more interesting...
- "open" rpg are great! (Maybe like in civilian life you can have a work for some money)
- Multi-player is always fun!
- Inventory and entering building is always great!
- For the best Rpg: Please god, don't do a kill mass zerglin and win game... plz!