Games are not a mathematics. One can not simply add up the numbers and figure out what makes a game great. Certain elements need to in place for a game to be great but even with all those elements in place a game's ultimate quality can still fall anywhere on a very wide spectrum.
A developer or gamer may see that a sequel has more of the 'good' stuff and less of the 'bad' stuff than its predecessor but that is far from a guarantee that the sequel will actually be objectively better.







