Update 28/07: Bethesda has addressed the login complaints via social media. It should be optional and a fix is on the way:
The BethesdaNet login requirement was included for the Slayers Club, to reward members for playing the classic DOOM games.
The login should be optional, and we are working on changing the requirement to optional now.
For more information, click here.
As you might have already discovered, the first two games require you to login to your Bethesda account or sign up if you want to play them. In fact, you can't even get past the title screen without a user account. You'll also need to sign in if you want to play these games in an offline state.
Here's the fine print at the bottom of both Switch eShop listings:
Direct-Feed Games has confirmed DOOM 3 players are not required to login and the warning above is not present on the game's eShop page.
What are your thoughts about this requirement? Has this soured the surprise? Leave a comment below.