Special mention to New Vegas as a “Bethesda published” title that could have been included on the list… the best fallout and one of the greatest RPGs of all time.
I still remember the first time I saw a Bethesda game was in 2010 when I worked at a summer camp. Another counselor was playing Oblivion in their cabin. I bought it a few days later and still hold Oblivion in a special place as my intro.
I know it is the boring answer but it has to be Oblivion, Skyrim and Fallout 3 for me. Those 3 games helped to define the 360 for me and I spent the most amount of time wihh those 3 games out of the list.
I voted Skyrim, Dishonored, and Dishonored 2, but after sleeping on it I think I’d change Dishonored 2 to Oblivion. It was my very first Bethesda game and my second ever WRPG (after Mass Effect). I never did properly beat it since I didn’t like the combat, and also on one of my attempted playthroughs my save got corrupted, but I still probably spent 100 hours with it overall.
Skyrim is one of my favorite games of all time and I prefer it to Oblivion in most ways, but Oblivion planted the seed for that type of game in my mind, so I give it credit for that.