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In my opinion, Oblivion is fun for about 1 day then it starts to nosedive with repetition. The enemies and available equipment level up as the player does so you never really make any progress. And enemies are never really dangerous; even if you increase the difficulty level, you just have to whack them with your weapon more before they'll die. The quests are nearly identical and very repetitious- 'go to said place, kill everything that moves and collect the loot'.

Unlike Morrowind, in Oblivion all the towns are nearly identical and there are only 2 or 3 different types of terrain.
The player character doesn't really have any personality either. In KF, you play as a hero or in other games you can choose to be a hero or a villain, but if you want to complete all the quests in Oblivion, you'll be acting like a psychotic sociopath one minute and a valiant hero the next.

I'd say that about 50% of KF fans like Oblivion and 50% think it pales in comparison. You might get lucky and be in the 50% that like it.

Personally, even though they aren't first-person, I think Gothic and Two Worlds are closer to KF in spirit than Oblivion is. Like Hguols said, Arx Fatalis is the closest game I know of to the KF series.