I put quite a few hours into DA:I too; I can't remember how many, but definitely over 100. However, I'm not complaining about it. I did it because I wanted to. Likewise with The Witcher 3--I put over 150 hours into it altogether and I'm fine with that. I thought it was a fantastic game. I think MysterD is correct about the setting and characters being more important than combat. Personally I think the first game in the series had the best combat, but I enjoy Sapkowski and CD Projekt RED's fiction, so that's more significant to me. If you don't enjoy the setting, it may not be as much fun for you.
Eh, I think there's something wrong with you if you're seriously implying that both The Witcher 3 and The Dark Knight are overrated. Because they're not.
Disappointing and yet you give it an 8/10? It can't be that disappointing then. But, yes, you've really barely scratched the surface of the game if you're 8 hours in.
How many of the so-called best RPG's have had "meh", "passable", "clunky", "solid", or "not-so-spectacular" combat?
For starters, here we go - Vampire: Bloodlines; Witcher series; Deus Ex (original); Planescape: Torment; FO3 + FO:NV; and Elder Scrolls RPG's.
RPG's are really supposed to be about choices / branching paths / decision-making; story; plot; characters; and atmosphere. The combat is supposed to be secondary to all of that stuff, TBH.
But, no - ever since Mass Effect 2, everybody expects RPG's to have incredible combat. Newsflash: ME2 wasn't a damn RPG, TBH; it was really a shooter-first with some RPG elements. A hybrid of the two, yes. Fantastic game + easily the best one in the franchise, but not entirely a RPG. A lot of the RPG elements there got chucked to the curb (Inventory, weaker upgrade system, modding to the weapons, etc etc).
Then, we have something like ME: Andromeda, which feels more like it's even going further down the shooter-first route with ARPG elements + also some regular RPG elements thrown in. I feel like I'm doing more ARPG-stuff (i.e. upgrading skills) + MMO-style side-quests w/ no choices than anything else + I don't feel like I'm making many decisions around here. At least not yet w/ the decision-making mattering, anyways - some 7 hours into this Trial Demo or so. And TBH - the story + character + plot stuff just ain't on the level & depth of the classic ME Trilogy.
EDIT:
There's a reason many players prefer FO3 + FO:NV over Fallout 4 - actual role-playing. Somehow, Bethesda figured out how to make a RPG (with the typical good, neutral, and evil choices found in FO games) that has also shooter elements work. Obsidian's FO:NV expanded on the RPG elements w/ even more decision-making & added much better narrative, character & story-telling depth.
B/c the combat wasn't so hot in FO3 + NV, the 100-point numbers system for skills (i.e. Guns, Speechcraft, etc) got thrown out and rolled into the Perk system w/ a few Stars you can upgrade (up to 10) for Fallout 4, streamlining the game - improving the combat. And if that wasn't enough, FO4 often just offers up just different shades of Good (i.e. Nice Good, Sarcastic Good, or still do the Good thing while being Evil extorting NPC for money/equipment) - again, simplifying + streamlining the RPG system that made previous FO's (Fallout 1+2+3+NV) so damn great in the first place.