Both of those views are a trifle simplistic, and the past is more complex than either. Tolkein certainly has an excellent sense for it, though, which is nice.I have no sympathy for any author who is pining for "past glories" - there's never been any past glories, just mud and blood and ignorance.
That said I'd substantially agree with the more negative appraisal, because I never pine for a past world (this one is I think a whole lot better), and to me the forests being cleared for an industrial revolution is progress!