yes there were seven games the 4 from the first series and three in gu the games that followed up on the the .hack roots anime but they havent made the mmorpg yet they are working on a japanese one but its very limited
Dot hack is amazing and I highly recommend the series to anyone that's looking for an extreme story. The first four series of .Hack games doesn't have the best gameplay but the story is one that can pull you along if you're truly into it. The characters all have very well thought out personalities and quirks and the type of people you have in your party is pretty highly customizable, so you don't have to run what feels like the same game in any dungeon.
The GU series on the other hand excels in gameplay but the story is somewhat tired. It follows a character who acts like any anti-hero but you know he's going to fall for the girl that's too enthusiastic about getting him to do good that any real person would want to murder. But it's fun and violent, so I've enjoyed it