My hood came flying up while I was on the freeway & SMACK!!! I'm just trying to make a decision here: Should I go out and get the hood skin replaced or is it not that bad & It'll be fine with some body filler patching?

 

Most body shops have dent pullers that would do the trick. Cool little machines. They would pull the dent and body work it... which is a whole lot cheaper than having a new roof skin put on. There's always the option of filling it with body filler too depending on how deep the dents are.