If someone played a video game, any video game, for a couple hundred hours, you'd say, wow, that person must really like that game. If someone played a video game, any video game, for a couple thousand hours, you'd say, woah, that person is hardcore.
Once upon a time, Maki Goto was a huge mainstream popstar in Japan. She was also a huge gamer and even appeared in Monster Hunter commercials in 2011. Now, supposedly, she's just a huge gamer.
During the last decade, Japanese singer Maki Goto was a big pop star. Now, she's a big gamer. That is, a big gamer apparently without a PS3.