

The tutorials are all difficult to read and it's impossible to read the maps without using the Deck's magnifying lens feature. I didn't notice if too many other UI elements are difficult to read, but I'd say these should be enough to bump it down to playable instead of verified.
The Deck mode (enabled by default) causes extreme ghosting due to FSR being set to a performance mode (you cannot change this). It looks atrocious and it'll make it impossible to see the ranged combat "reticle" along with other environmental details. You can disable the Deck mode with a command line, which allows you to set FSR to quality, but that'll cause performance issues.
It runs well enough if you're playing with the Deck mode enabled (default), but there are dips in framerate here and there.
All in all, it runs well enough all things considered, but it's hard to swallow when it looks this bad thanks to the heavy ghosting caused by FSR. I tried both the Deck mode, which was fairly playable, and the PC mode, which looked better with FSR set to quality but came with much more dips in performance. Also, the UI has plenty of elements, text and otherwise, that are quite difficult to read.

Online functionality stopped after I played on a Windows PC for a bit and returned to the Steam Deck

В папке с игрой переходим в папку LOTF2-Binaries-Win64 находим файл запуска "LOTF2-Win64-Shipping.exe" и добавляем в библиотеку стим. Возможно не обязательно так делать)))
Заходим "Свойства-Ярлык" разрешение экрана ставим 1024x768 так же включить "Задать разрешение для внутреннего и внешнего экранов". Настройка игры: Масштаб разрешения 100 процентов. Ограничение кадров 30. AMD FSR включить на "качество". Графика всё на низком, размытие выключено Настройки стим дека: Фиксированная частота граф. процессора 1500. Тип масштабирования FSR. Чёткость FSR 0. Самое интересное что FSR включаем везде тогда ФПС стабильнее(по крайней мере в начале игры).

Small and blurry in menus
Heavy FSR artifacting during fast movement.
Corrupted save game, game reboots steam deck.
Things look and run kinda great until the first true boss (48-28 FPS range). This is where you start to see a lot of on screen effects (fire, magic, etc) and fast movement. At this point things just start to look like a blurry, pixelated mess. The forced FSR (probably ultra performance?) just wrecks the visuals to the point that it's pretty unplayable.
Even pumping all settings to High still looks bad due to the upscaling.
I'm running mostly the autoset low preset with High textures and High AA - otherwise it looks like potato mode, you don't seem to gain a whole lot of performance between low and medium textures, but you do gain a lot of bling.

Force 1024x640 (and use FSR Upscaling), FPS limit 45, in game low settings.
Works surprisingly well given the limited hardware power, my PC with linux wont even start the game, but the steam deck pretty much just works.

Game could barely hold 25 FPS on Steam Deck all low with FSR maxxed

Hexworks have created a specific preset for the Steam Deck that hits 30FPS 95% of the time with very good image quality. Even on lowest settings - the default - the game looks insane for the Deck and the fact it's completely playable is actually shocking.