The only difference is that there wouldn't be a superior set of Spider-Man movies to draw comparisons from, which would make the criticisms that much more difficult to deflect. Uncle Ben's death would have still been hilariously ill-conceived, all of the villains would have still been poorly written caricatures, the plot to both films would still amount to little more than shameless, contrived, and incoherent world-building, (speaking of which) the subplot with Peter's parents would still be uninteresting, uninspired, and mostly irrelevant to the current state of affairs, among so many others; I really could go on and on.
This sort of backhanded question gets asked pretty frequently, and what people don't seem to realize is that these reboots and remakes aren't compared to their predecessors for sinister reasons, it's done to highlight the shortcomings of these movies in an easily understood, topical manner, but when it all comes down to it, the flaws apparent in these movies are still very basic and inherent to these movies themselves. A better set of movies featuring the same hero only serves to give them context, not to mention make them all the more apparent.
Really though, hypotheticals like this are silly for a number of reasons, not the least of which is the fact that if these movies were released in any other period of time, be it a year or decade, they would be completely different. Let's also not forget about the creative decisions that were specifically chosen for the differences to the now non-existent predecessors. There's too many variables for anyone to answer something like this intelligently.
At the end of the day, this is another "How did you like this movie" thread, because in all likelihood, everyone's answer will be in some way reflective of their reaction to the movie. Those who hated it will say that the reception would be the same or worse, and those who loved it will of course day that it would have been much better.