Not being a comic book purist, I see no issues with it. I mean, they made Tony Stark a weapons dealer, why not make a Spiderman out of a nerdy black kid who doesn't fit in?
Frankly, it doesn't matter who plays spiderman so long as the special effects surrounding him are cool enough. Ultimately, what matters is how they handle the bad guys. This is the true Achillies heel of superhero movies. The latest rendition of Batman has hopefully upped the bar some by way of villain treatment. Unfortunately for the Spiderman series, there's a whole lot of stupidity by way of villains.