World of Warcraft MMO its engine was fantastic the first years during release and until Cataclysm expansion end at least I choose to quit when next expansion after Cataclysm was released but it was still low system requirements when I quit. I mean very low system requirements for so good looking game. In fact reason one major reason why WOW MMO reached over 12 million players playing it same time paying sub fee each month at its peak was that excellent system requirements no loading screen in World Map travel seamless world good looking art I like WOW graphics. On top of that you can fly in WOW if Druid shapeshift or flying mounts and that is faster travel and still good system requirements when flying. Stable coding does not crash and no bugs and polished perfect.
One reason WOW graphics considered good by many is not that that it is very realistic looking, but easy to understand and fantastic cool art graphics sometimes. No WOW uses pretty cool art and example Blood Elves race look cool etc. Well and an Undead Dragon Boss looked so cool indeed in The Wrath of Lichking expansion.
You want cute things and do not like horror and Undead Dragons? In WOW you can have very cute lovely pets example a rabbit or something like that. All from Horror to cute things and it looks very good and often cool.
WOW have in time improved it graphics and today most modern WOW I am not so expert on its system requirements, but I doubt it is high system requirements.
Battlefield FPS games... the best of them are not what I would call excellent system requirements and FPS games generally do not belong to my top favorite games, but when I played campaign at times in Battlefield FPS games it felt like playing in realistic action movie the graphics were so excellent and realistic looking.
Future seems to be UNREAL 5, but keep in mind I intend to enjoy Unreal 5 in FULL HD resolution 1920x1080. 4k-8k resolution Unreal 5 can be very high system requirements and I have heard such rumors at least that if you set resolution to really high in Unreal 5 then it demands much more indeed.
