Not the person you replied to, but in my opinion was Oblivion was pretty good, but not as good as Morrowind. Compared to MW a lot of things felt dumbed down (i.e. beast races can wear shoes, no armour/clothes layers, no spear, etc.), and although I ~~don't~~ think there's much they could do to make the environment more interesting, ~~since the setting is what it's meant to be~~, the dungeons felt incredibly boring and repetitive.

However, I did quite like the story - especially how you are not a chosen one, which is rare for such games - and I thought a lot of the quests were pretty interesting, arguably at MW's level or better (there are definitely some exceptions*). The Dark Brotherhood quest line especially, which is not present in MW, and is much better than Skyrim's DB quest line.

*I will also add something that I hated: despite not being a chosen one story, it allowed you to be the head of all guilds, resulting in a quest where you may have to steal something from yourself.