I think Inquisition's weakness is the lack of tie-ins to all the zones. I think it has a really strong story, but it's just way too short. Instead of getting to Skyhold and having ten zones open up, it would be nice to have a reason to go to those zones, like "you have to meet the Warden" and that's how you get to Crestwood. Instead it's just that yeah, the Empress is having a party and there's also weird stuff going on with the Wardens and suddenly there's suspicious activity in the Western Approach that desperately needs investigation!!!! What? Why do I care about unexplained suspicious activity if there's an assassination plot and blood magic going on?
Yeah, the tie-ins for some of the regions were a tad weak.
The Western Approach at least had the whole build up to the Siege of Adamant, Crestwood was good because you had both the dynamic nature of the environment and were there to track down the Warden, while the Hinterlands was pretty much given a ton of plot as it was the first real place you spend the game in and is important if you want to side with the Mages or go to Redcliffe. Emprise du Lion was only really important to the Red Lyrium storyline but didn't have much else, while the Oasis was only good for the shards to get into the Temple, but lacked much else to hold interest?
Everywhere else seemed so... inconsequential to anything?
The Emerald Graves were great but didn't have much in the way of any bearing on anything, in the Exalted Plains, until the Inquisitor tells them (and if you even bother to do so), neither side is either aware that the Civil War might have actually ended and the Hissing Wastes seemed more like they were setting up hints for future DLC or the next games than anything else? Then you had the Storm Coast and the Fallow Mire, which have zero reason to visit (except for recruiting Bull) or revisit once you've completed them.