If you hadn't heard of Tom Holland before he was announced as Peter Parker, then you were in the same boat as pretty much everyone else on the planet. Here's why that is a good thing.Casting an unknown for an iconic role like Spider-man can really pay off in a big way if done correctly. Christopher Reeves and Hugh Jackman both cemented themselves as the definitive versions of Superman and Wolverine and at least part of that can be attributed to the fact that they were relative unknowns when they played those parts. The audience can only connect to the character, rather than responding to an actor they already know and like. It will necessarily bring out a better performance, but it makes the audience more likely to connect the actor and the character in their mind. This will be especially important for Spidey, since we've already have two previous version in the past 15 years. People need to feel like the MCU (Marvel Cinematic Universe) Spider-man is the definitive version, and I think casting an unknown is a great start.One could argue that Andrew Garfield was relatively unknown as well, so the quality of the film certainly plays a factor. It certainly helps that the original Superman and X-men 1 were both great films in there own right. Marvel realizes that Spidey is there crown jewel and that THE Spider-man movie has yet to be made (sorry Raimi). The fact that they cast an unknown actor and a relatively fresh director makes me feel like they are really swinging for the fences with this one.I'm excited for a Spider-man movie for the first time since that Jazz Club scene in Spidey 3, and for that at least I appreciate that Marvel is taking some risks.