Anyone who is new to metal is always going to find more excitement in what is current than someone who has been around for five or more years. If you find someone who genuinely is going to be interested in metal, you can put whatever you want in front of them and they'll like it, mostly. More things sound fresh when you haven't heard that many albums, the more you hear, the less this is the case. Thus, people become crusty and whiny when they've heard several hundred albums and things start to sound samey. They blame metal bands sucking, when they are really just bored with metal. The problem is on the listener's end. The things that resonate with these people are then the albums that they first liked, albums that resemble those in an authentic way, or the rare thing that's genuinely new (sometimes).
I don't really think that all that many of the classics would have that much staying power if they were released today. This is not to say that they aren't important. I think it's just as bad though to ignore the classics than to ignore the current scene. You could swap HLTO for Forgotten Legends and TH for Inquisitors of Satan and not miss out on much. Most classic albums do end up being done just as well, if not better by other bands. But people are herded into the classics from the get go, and in most cases, what people hear first holds a soft spot for them.