What was the last good game they released ?
I felt both skyrim and FO4 were pretty good games. They took the old Bethesda open world formula and extended by adding things like radiant AI, unscripted dragon attacks and base building.
Any complaints you have about the game such as shitty UI on PC version or dual welding of shields can easily be fixed via mods, which is another plus for the series.
The problems with the latest Bethesda games in my opinion are:
1. They are too long. Only most enthusiastic players will have the patience to keep up till end, especially once you reach high level so that everything just becomes a squash match
2. Instead of using radiant ai to help player explore more areas, they use it to give repetitive boring quests.
Edit: also skyrim needs to change their levelling system to skill points based system like in fallout series