Star Trek Online

From Captain Customization
To Crew Customization
To Ship (Inside and Outside) Customization (including it's name)
To Uniform Customization
To Exploring planets
To Exploring the Galaxy
To a great Battle and PVP system (manual/Auto and skill)
To Joining Fleets
To The Multiple Professions
To walking around the ENTIRETY of your own ship (Takes me 10 minutes real time to explore my entire ship, rooms hull and all)
To exploring the Space Fleet Academies and Star Fleets
This game is fucking incredible
It's damn addicting
And it's amazing to just get in your ship, shut off the lights and cruise through space when you're high.
It's also got a Music Player to play either Online Radio, Music from your iTunes, ,or from your Winamp