I decided to play the game following the remastered version's release, both that one and the original. After completing the game, I wanted to share my thoughts on Elder Scrolls IV: Oblivion (the original, as I have not yet started the remastered version). Keep in mind that this is my opinion.
Pros.
The game isn't nearly as buggy and glitchy as Skyrim. At least, not that I noticed.
The factions are more enjoyable than Skyrim. Where the Companions questline was a convoluted snooze-fest, the Fighters Guild was fun and kept my interest.
The Arena was a lot of fun.
There seems to be more to explore than Skyrim.
Even though Oblivion is ~5 years older than Skyrim, the game's environment feels more scenic, which I'm a sucker for.
The game's mechanics were a pain to learn, but easy to understand once I got the hang of them.
The main story was great.
The game isn't filled to the brim with nonsense. As in, no civil war mixed with a dragon crisis and racial tensions between Nords and everything else and its mother as a High Elf extremist regime threatens everyone. I swear, I felt like Sheogorath was having a field day in my mind with that malarkey.
Sean Bean and Sir Patrick Stewart were in it! They voiced Martin and Uriel Septim, respectively.
Cons.
Lockpicking is a pain in the butt.
Speechcraft mechanics are fraggin' stupid. The whole persuasion minigame feels like it's pure luck.
If you become over-encumbered (which happens easily, as 1 sword could take up over 1/3 of your carry weight), you can't move at all.
Joining the Mages Guild was stupidly tedious.
The characters' faces are nightmare fuel.
Overall, I give the game an 8/10. It was a lot of fun, and I see myself playing it again. I will also say that I enjoyed it more than Skyrim. Yeah. I said it. Oblivion, I can enjoy without mods. Skyrim, on the other hand, I hate playing without mods. I need at least 100 bug patches just to make the thing playable.