"Quality sequel" refers to a follow-up or continuation of something (such as a movie, book, or video game) that maintains or even exceeds the high standards and excellence of the original. Full definition
Which is a shame, not just because the game deserved better, but because it means the chances of a good quality sequel are even more distant than ever. (metro.co.uk)
If Nintendo are successful at anything it's tapping into nostalgia by producing high quality sequels to their old school classic titles. (gameluster.com)
If only this week's game was some sort of classic that spawned an entire genre and many quality sequels. (thatvideogameblog.com)