The games I still enjoy playing have poor low resolution graphics, but they're challenging and fun.
This is one of the things I respect so much about Nintendo; they haven't given in to pressure to make everything realistic. They keep their focus on the game play and allow players to use their imagination when it comes to graphics.
The more realistic the character drawings are, they less _you_ project yourself into the story.
If this works for a static medium like comics, it could be much more important for dynamic conten like videogames. No wonder that cartoon-like characters like Mario, Link, or Pacman comes to mind before Chris Renfield (for instance).
What?! Okay so it might not look quite as pretty as The Witcher 3 or Uncharted 4 but it still looks modern. The explosion/fire/smoke effects are beautiful. The art style isn't for photo-realistic but to have a unique-yet-familiar style that allows them to make use of exaggerated/cartoon-like presentation.
Saying it looks like a 15 year old game is extremely unfair and totally wrong.
Do people really care about graphics that much? My guess would most casual gamers actually don't. Gameplay > all.
At least you can reuse their "hardware dongle" for more than a game ;-)