I don't. Morrowind had flaws, but Morrowind had so many things. deserts, swamps, jungles, canyons, desert storms, golden wastelands, metropolises build by stone, small obscure fishing villages, dark castles, insane amount of dungeons/fortresses/castles/houses/small settlements, beaches, mountains, snowy areas, murky roads, generic forests, exotic forests and so on and so on... and temples.. and basilisks.. and.. and...
And oblivion? Oblivion might have been bigger, but it was just one big copy pasted randomly shit generated piece of green forests, with a bit of frost on top... f**k. I never played the expansion, but bethesda does... goddamit. god it made me hate oblivion. no point in exploring that world.
in morrowind, every rock and tree was put their by design. same with WoW. you can feel the love that went into creating does worlds, which made them fun to explore.
but oblivion. oblivion was made to be an authetnic crappy green happylands forests.. everything looked the same. it sucked. i hated it. I wanted it to die. I still do.