Tiny upgrades, or should I say tiny changes (because upgrades is generally a misnomer)
Case in point, (totally a statement of opinion here btw) Baldurs Gate 2 was awesome, Since then Bioware has changed very little each iteration but what they have changed is to the detriment of the game, so you reach a point where you are spectacularly bored of the old stuff showing up again, but the few changes are generally bad too. NWN was a disappointment and since then the BW games have got progressively worse thanks to them all being so similar.
Sweeping changes and fresh ideas are the only way to go imo, Speaking personally, it is what keeps me interested and excited for new series' games. From experience, there will always be a few changes that annoy you(me) but there will also be many new intersting gameplay aspects to explore.
If you know you are just getting a minor upgrade on the same thing I generally find there is very little to look forward to. To the point I have got so bored of those series/companies games that live off 'tiny upgrades' I have just stopped buying them all together. And I never bought that many games annually to begin with anyway. In fact if it were not for 2 or 3 core franchises I probably would have stopped gaming long ago...
PLAYSTATION NATION LADY OF JRPGS 
Favourite Games of 2013 1.Tomb Raider(PS3) 2.Atelier Ayesha(PS3) 3.Virtues Last Reward (Vita)
