The phrase "great replayability" means that something, like a game or a movie, can be enjoyed multiple times because it is interesting, fun, or has different outcomes each time you experience it. Full definition
This provides great replayability value to the game as well as an extra goal for completionists. (gaminginstincts.com)
And the Island Expeditions mode will include randomized elements for small groups to enjoy with great replayability which is very important in the game like Global Warcraft. (seekingalpha.com)
It also adds great replayability for previously visited dungeons for the opportunities to find new items or battle greater foes. (selectbutton.com)