I don't really understand your poll choices, since there are 6 options, yet only 3 scores...
But anyway, 6-6.5 is far too low in my opinion. It's a high quality game with loads and loads of content. It may be getting a bit stale, but this game is a solid 8. The series already hit it's high point with Ryu ga Gotoku Kenzan, but the 3 games after it have all been great. I'm speaking as a huge fan though, this series will likely never get old for me. 6 is an unfair score though.
