Well, no.
The reason I love Oblivion so much is because it was so... uh, the only word that can fit here is awesome. But really, I have reasons.
1. Your character isn't some established personality (I hate games where they give you a name and history and say "go play". Well, I can't, I'm someone else now. Thanks). And he's important! Hell, you save the world. AND YOU ARE WHOEVER YOU WANT TO BE.
2. You didn't like the main quest? Well, alright, y'know, it's your opinion. Personally I though it was cool, but I'm not an English writing major (yay). I'm pretty sure that the guild quests made up for it though. You said a thief should have a thief background? Well, they can have a thief story. Also, Dark Brotherhood. Fun times.
3. You didn't like any quests? Don't do any. Oblivion has such a huge world you don't need to. Also, just because fast-travel is an option doesn't mean you have to use it. I only used it for quests. I've spent probably around 50% of my time playing Oblivion just tooling around in the countryside, emptying out dungeons by the bucketload. Or whatever standard unit monsters are measured in.
4. Were you playing on the 360 or PC? Play it on the PC. Really. There are SO many good community mods, it is pretty much ridiculous. Speaking of mods, specifically official mods, Shivering Isles.
I'll repeat that. 5. Shivering Isles.
Again? No? Alright. Shivering Isles was probably the most uncannybrutal part of Obliivon. The expansion was better than the original game, despite being one fourth the size. It was so much fun, and it looked so crazy, it was like you were in your own fantasy world! Unlike Oblivion, which was the traditional forest/field/lake/swamp/mountain/snow type of thing you could find in present-day England. But Shivering Isles was so incredibly delirious biznasty, it was unbelievable. It pretty much made up all the flaws in the vanilla game, and then some. Plus Sheogorath was hilarious.
6. I'm not sure how the combat was bad. I mean, yeah, it wasn't exemplary, unless you were a wizard, in which case YOU CAN SHOOT LIGHTNING WHY ARE YOU COMPLAINING. If you were an archer, you can pretty much snipe people. If you're a warrior... uh... hit stuff. I don't know about you guys, but punching a minotaur or armored demonic warrior to death is pretty exciting. You can't get as many weapon choices as in Morrowind (my wakizashi! No!) but getting and then enchanting your weapons to destroy is pretty fun. The movement is sort of iffy, but that's more of a "Bethesda-wide" problem. I felt that in Fallout 3 and Morrowind as well.
7. Yeah... the leveling monsters was sort of lame. However, this only became clear near the super-endgame, at about level 30, where a goblin could take 100 hits to kill but kill you in 20 hits. But the actual character development was fun. Do I want to be able to outrun everything on the planet, be able to take an army on wearing nothing, or be able to one-hit-kill a god? Also, magic. YES. You could do anything. It wasn't a class-based system, you just picked some from the start and could do anything from there.
8. Okay, I know you probably didn't pick up on this, but the lore of the game world was indescribably interesting. In Morrowind, I picked up and read every book in the game (I probably had every book in the end). In Oblivion, I did the same thing. Some stories were hilarious, some boring, some informative, some unnecessary. Either way, I got to know the world. It is fully realized and completely EPIC. Did you know that the plane where Nirn (the planet) exists is called Mundus? Did you know that this isn't the first time the Daedra of Oblivion have tried to invade? Did you know about the Dwemer and Ayleids?
No? Well, that's fine I guess. BUT IF YOU KNEW YOU WOULD LOVE IT.
Oh yeah. Voice acting. Uh... we don't like to mention that around here.
anyway i love this game probably the best ive ever played i mean i havent played many but wow i could play this thing forever literally right isaac