Do you plan on playing any other games? If you're only going to play "just" MM, then no. I don't even think MM is fully fleshed out compared to the original Spider-Man game. It's much shorter fwiw.
I think so! At least, when PS5s are back in stock. But the minimum of $450 you'd pay to experience this game with ray-tracing and smooth fps and open the door for God of War 5 and Final Fantasy XVI is def worth it, I think!
Definitely not. It's just a slightly upgraded, trimmed down version of the first game. If you haven't played the first game and just want to play a Spider-Man game, buying a used PS4 and the first game would be much more worth it.