Well, Star Wars: Knights of the Old Republic was made by the same people as mass effect. May be a little older than the timeline you suggested but it's worth a shot.
You could check out Oblivion and Fallout 3 as well. On that note Morrowind and fallout 1 & 2 are some of the best games I've ever played.
1) Fate (infinitely replaying "Diablo" style game) 2) Risen (much slower paced than Diablo, but massive and more akin to Elder Scrolls: Oblivion. There are multiple Chapters and I'm 18 hours in and only in Chapter 2) 3) Titan Quest (Think 3D Diablo)
Well, Star Wars: Knights of the Old Republic was made by the same people as mass effect. May be a little older than the timeline you suggested but it's worth a shot.