I'll be the contrarian here. As an owner of Doom (2016) on Switch, I was very happy with it. Played through it beginning to end, sometimes docked, sometimes handheld. Totally happy with the game.
So much has been visually improved between that game and Doom Eternal, however, that I feel this Switch version can no longer keep up. The visual differences are just too stark now. I can appreciate that it runs/performs well, but removing motion blur is a deal-breaker for me. I loved the effect in the 2016 Doom. I'm sure it's still fun, but for me this is an example of a game that - technically, yes - can be ported to Switch. I don't think it was worth the effort.
As a Doom fan, I'd pick up the Switch version for $10-15 if that ever happens, just because I'm a "Nintendo only" gamer and it's this or no Doom Eternal at all.