Define "ground breaking". If you mean they don't have new gameplay mechanisms, well ya, it is hard to come up with new things in a mature space, a lot of kinds of gameplay have been done and it isn't easy to just magic something new in to existence. When videogames were new it was much easier to have "ground breaking" gameplay. Hell Pong was ground breaking...I disagree. Few games are as ground breaking as they were before.
...unless you look at air hockey. When you look at other media, it turns out that games really are never ground breaking. You can find antecedents in literature, film, board games. etc. All art is effectively derivative, we are all influenced by the things we consumed and it influences what we create. It's why you can look at any novel and talk about other novels that came before it that it is like, or any band and talk about the other bands before them that their sound is reminiscent of.
I think things were not as groundbreaking as you want to think, you just felt that way because it was the first time for YOU.