For instance...
morrowind had a better story than it's successors
Morrowind had proper dumner voices whilst oblivion and skyrim deal harsh injustice to it
Skyrim's quests weren't half as good as some of the oblivion ones.
Oblivion did not have as good an art direction as morrowind had. Some (the Ones who are smart) would also argue that morrowind often did better in art direction than skyrim.
Skyrim has broken the armourer skill.
Skyrim has a crippled skill system and the perk trees are broken. (perks are ment to add a small twist to gameplay- Not control the whole thing.. *glares angrily at the 0/5 perks* )
Skyrim had the weakest array of spells and weapons for the player out of ANY elder scrolls game.
Skyrim had the worst Ui. horrid on all playforms.
Least imaginative dwemer award goes to skyrim. The orcs are less interesting. The nords and imperials are less unique.
Skyrim had the worst enemy variety of any tes game. the player adopts two or three strategies for everyone (depending on their build and how powerful an attacker is)
Skyrim had the worst social interaction.
Skills were not Completely better. for instance I could never get into enchanting in morrowind, however skyrim solved this problem by making enchanting boring and limited.
skyrim also added the weakest selection of books. i quite enjoyed "a tragedy in black" However.. I also considered the laziness of "advances in lockpicking" as that would suggest that some lunatic went into every burrow and dwarven ruin to change the locks!!
Clearly- Skyrim DOES do things better than the other games: it's combat is almost not terrible. Skyrim's races look more unique (although the bretons did loose their elven features that they were supposed to have. I do not know why although lazyness comes to mind) skyrim also has better graphics and a weight slider.
Financialy- Skyrim did better than the last two games because of the increased market size and company power. Plus the name. I don't think bethesda are benefiting from stupidity. There are ways to make the game accessible and complex- Why havent bethesda done them?
Shouldn't each Tes game build upon What could be better and strive to keep all forms of quality?