A truly underrated sequel to the wonder that was Dragon Age: Origins. Although I do agree that the game fails to match up with its predecessor in many ways - from player choice practically being ignored to reusing many areas and enemies, the game still manages to be a thoroughly immersing and enjoyable experience.
Although Hawke, the game's protagonist cannot be as well-defined as the protagonist in Origins, having a definitive background allows Hawke to be have the most personal storyline, as opposed to being isolated from the narrative as a savior archetype. Not only that, but Hawke themselves is a very personable character, whose personality can be defined and redefined by the dialogue choices you make, which do have some impact in dialogue and subplots.
Furthermore, restricting the game to a singular location allows you to have a more personable experience with the location, as opposed to simply stopping by for a few hours to save everyone, you experience what life is in Thedas, and you see how the narrative in the world around you progresses.
The narrative, although being my least favorite aspect of this game, especially due to the game's third act and how it handles the overarching conflict, still manages to be immersive - out of every Dragon Age game and DLC, this is the only game that has made me legitimately cry because the game managed to make me care about its more minor characters.
The gameplay is also the most enjoyable in the series. Some do not enjoy the more fast-paced and action packed change of style, but it personally made the game's combat more enjoyable for me - Dragon Age is partially notorious for having rather bland gameplay, and Dragon Age: II provides the most enjoyable combat experience.
Finally, the characters are what truly make this game my favorite of the series. Not only are there practically no restrictions of who you can romance - a win for player-choice and homosexual gamers, but your relationship with the characters is more three-dimensional, as you can either be a friend or a rival to them, and in both instances you can romance the character, leading to a lovey dovey romance, or a toxic relationship. The best part about the new relationship system is how rivalries might actually be better for those characters, as friendships often enable them to do dangerous things, whilst rivalries can prompt a change in perspective.
Dragon Age: II is truly an underrated gem, despite all of its flaws, much like Origins was despite its flaws.