BackFire
Blood. It's nature's lube
I've been playing through Inquisition for the third time in preparation for Trespasser, which I just bought.
I have to echo the sentiments above. The open world segments of the game really are some of the weakest portions. I hope that the next DA game, and Mass Effect as well, don't go to heavy into the open world direction. It simply doesn't really play to the strengths of Bioware, which is character moments and Lore. Bioware seems to go the way of Ubisoft when it comes to open world environments, treating as a map with a bunch of pretty generic points of interest that only exist to bloat the amount of time spent playing the game, with very few interesting sidequests to be found. This is in stark contrast to The Witcher 3, which has brilliant sidequests throughout the world that are completely missable.
I've found the best way to play DA:I is to basically ignore almost all the sidequests when you get to a new zone, just do the main quests of that zone and nothing else. You end up spending maybe an hour in each zone which is a good amount for what each zone has to offer. Helps with the pacing a lot.
As far as if I want a linear or open world DA game for the next one, I'd prefer if it was both, like DA:I is. What I think the problem with DA:I is is that the ratio is off. They put more emphasis on the open world portion and less on the linear story missions. There's simply more zones than there should be. For the next game I'd prefer if there were more linear story sections, and less open world portions. There's what, 12 open world zones in DA:I? Most of them have a couple interesting things to do and that's it, I'd prefer maybe 6 or so in the next game, but just have those 6 zones fleshed out really well and be made to feel realized. Witcher 3 does this, and it's simply superior for it. As a result the world feels more alive and real.
As far as which series I enjoy more, I'd have to give the edge to Dragon Age as a whole. I've enjoyed all the games in the series. Where with Witcher I didn't like the first game, enjoyed the second a good amount, but loved the third. I think Witcher 3 is better than any of the DA games by a pretty significant amount.