Are you willing to share your reasons for dislike? I am interested.
Main reason? The most FUBAR dynamic difficulty system any game has ever attempted, sans SIN: Emergence pre-patch. Only game I know of where levelling can make the game drastically harder to the point that it ultimately forces you into a specific playstyle to even be able to play the game. Mostly generic appearing dungeons, including the Oblivion gates (though I concede that the layouts often were different and some were quite nice). These two elements conspire into removing any incentive to explore in the game. Ultimately, the way to get the best equipment in the game isn't via exploration and dungeon crawling, it is by finding a place were humanoids respawn after your character gains the appropriate level.
Functionally, this is the complaint. As my character levels, being a stealth based character, I end up having more and more difficulty killing anything. Just until I get to the sweet spot where I can hit an enemy 15 times to kill them without them acknowledging my character is there. And there feels something incredibly nonsensical about hitting a guy 15 times in the back without the guy even turning around. But, luckily, if he did, my character would usually die instantly. If the enemy was a Clanroth, he would die anyway. As an explorer, I like to see what is to be found and what there is to see and discover. Sadly, the only thing there is to see in any of the dungeons are the same looking walls as the rest of the dungeons and the only thing to discover are rusty iron hammers.
I know another said it was better than Morrowind, but from my perspective, Morrowind was tons better.