The dlc gets rid of the single biggest issue with the main game: the padding. I've always maintained that DAi was a masterpeice 80 hour game stuck inside a post skyrim 'we need to have 150+ hours of gameplay' open world rpg.
This is nearly exactly how I like to describe Inquisiton but shifting the numbers around (a lot). Inquisition is killer 30-40 hour RPG trapped under 70 extra hours of MMO fluff and why repeat playthroughs are very difficult to even want to undertake. I started a second playthrough but still got lost in minutae in the hinterlands and haven't left that area and ended up getting side tracked as I tend to do.
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I wasn't really impressed by the two 'other' DLCs. Jaws of Hakkon was still largely a big open world MMO fluff DLC and the area story and design didn't exactly hook me a lot or even made much of an impression. It was pseudo-vikings and not much else to me. Maybe the Solas-romance adds a different flavor to the entire thing given what people have said about it but coming to that DLC long *long* after that fact in a post-game Qunari Inquisitor, the story of Jaws was completely nonplussing.
Descent is mediocre with a cool neat lore dump towards the end but as someone that has always had a fondness for the Deep Roads and their aesthetic (I always liked that section story-telling wise in Origins), I didn't mind it as much. Being much shorter and combat dungeon crawling focused helped reduce the "MMO fluff" feeling nature of the game.
Trespasser is good. But honestly the way people constantly hyped up Trespasser probably warped my expectations for it to do a bit more. It's absolutely a neat epilogue DLC but the way people talk about it make it seem much more meaty and chewy storytelling wise than it honestly ends up being. General spoilers for trespasser just in case:
It's just sort of a lot of humming-and-hawing until the big five minute final encounter with Solas at the end of the DLC. The entire meat and impact of that DLC is all concentrated in its closing moments and everything before that is largely just... okay and serving as light epilogue and seeing characters again in a post-game context .
I like Inquisition a good bit but I only played through it fully the once at launch and any nuance or details in the storytelling is largely gone to me now aside from the big *big* moments. And also Morrigan but I can literally never say no to Morrigan. I still genuinely like Inquisition a lot and it was cool to see Loghain again. Sorry Hawke, I can't let my man Loghain go.
I started a second character, lady elf (for very obvious reasons), but never got very far with that second playthrough as I said. I will try to get back around to it once I burn through a lot of these game pass games I'm going through. I do feel a bit disconnected/jaded in a lot of the discourse around the game because, epsecially going into Inquisition, I just don't care much for Bioware romance writing anymore. So much of it feels like dating sim + extra RPG attached as far as many conversations seem to go so if you're not into the romancing stuff it feels like you miss a huge huge portion of the character writing. Though it's a bit ironic for me to say that cause I will, as I said, literally never say no to Morrigan but I guess that's cause Origins hit at the different moment for me and I'm now just not as much into the romance stuff.