Ehh, I don't want Infinite to be used as an inspiration/example for a Bioware story, especially in the ''mindcrew twist ending', department.
*Looks at ME3* aw shucks, too late...
More seriously, I don't consider that game a great standard. It's good an above-average plot with interesting concepts, but they fail to all tie together (IE the Vox Populi/Founders conflict having very little to do with the whole magical quantum mechanics shenanigans, becoming little more than generic enemies to shoot, or Booker being the only one to use Vigors save for a handful of enemies). While, for example, Bioshock's splicers tied very neatly together into the plot and setting, just like the usable plasmids and whatnot. Both games have dissapointing endings, but at least Infinite's didn't depend on a silly ''moral choice''.
On the plot front, it's true that Bioware hasn't impressed. Like, ever. Their only great plot IMO is Jade Empire. The rest is good (KOTOR, ME1, BG1), decent/mediocre (BG2, ME3, DA1) or just plain bad (ME2, DA2). They could learn several things from Obsidian or CD Projeckt RED. Mask of the Betrayer, Planescape: Torment, KOTOR 2 and Witcher 2 are examples of what I consider great plots. So far, Inquisition's plot doesn't seem especially original (a rehash of Origins with demons instead of Darkspawn?), but admitedly we haven't seen everything yet. It might be they will surprise us, but I don't expect an amazing main plot.
Their strength has always, always been in characters. They beat pretty much everybody in the business on that front, and I doubt this is going to change anytime soon. You CAN have great characters and a great main plot, but IMO Obsidian/Black Isle are the only ones to have ever managed that, and even then only in a handful of games.