It was not a parody at all. It was a Spiderman film through and through.
Good animation is neither cheap nor easy. Especially not stylized animation that requires a great deal of compositing and effects work, like this one.
And suffice to say, the movie was absolutely fantastic from top to bottom. They certainly didn't make a "cash grab" film in any sense of the word.
But don't take my word for it:
https://www.rottentomatoes.com/m/spi...e_spider_verse
282 positive critic reviews. Versus 8 negative critic reviews.
https://www.metacritic.com/movie/spi...e-spider-verse
Rated "must see" and "universal acclaim" on metacritic.
Now I wont mince words; this is not some "grimdark spiderman" full of angst and blood and guts. But the film does not pull its punches when it comes to things like death, family drama and dark subject matter. It just chooses to deal with those things in a decidedly adult way, instead of a dark and gritty edgelord way. (Something they actually poke fun at in one point in the film.)
So I suppose if you're expecting dark and brooding (and for some reason see spiderman as the posterboy of that,) don't go see it.