Yes, it's campy. Yes, the acting wasn't very good and the scripts were dull. Yes, the special effects are *very* dated.
It doesn't matter. "Amazing Spider-Man" is one of those time capsules that perfectly captures late 1970s action TV. It was funky, it was campy, it was cheesy, and it was great.
Sure, it could have been better. Given time, the series could have hit its groove and easily been as good as the other Marvel TV series of the day, "The Incredible Hulk." Legend has it this show was cancelled because of low ratings, but I heard CBS both wouldn't commit to a consistent timeslot, and they didn't want to be known as the Superhero Network (they had "Hulk," "Wonder Woman," and showed the hideous "Captain America" and "Dr. Strange" movies). They could have had a real winner...