The only bad quests were new vegas which overall was just fallout 3 in desert form but bethesda brout the elder scrolls games out of the dark n made it an open world game which is the best part of all the games and oblivon n fallout 3 quests are argubally amazing
new vegas has TONS of quest. but like someone said 'there's a difference being doing 100 errand boy quest and doing 5 memorable quest'
I always amazed with OB quest like the Bruma countess asking you to find out Akaviri artifacts or protect a family from warring goblin tribes or the quest find an imposter that accidentaly his twin separated from birth and it continued to a larger plot and reveal their past.
and in F3, there's a quest find a missing android that gives me 'WHAT THE HECK? THE GUY I ALWAYS TALKED TO AND SEEMINGLY NOT INVOLVED IS THE KEY TO THIS QUEST?' feeling. or help an old lady find her 'pass on generations to generations' violin. and the reward is great and satisfying.