Before i saw Decade i saw episodes of Kuuga, Ryuki, Blade, Kabuto, and Den-o. My fave out of those was Kuuga because of the solo hero focus it had and giving the other characters more depth and important roles even though they dont have powers like Kuuga. Kuuga was a dark series with monsters called the Grongi killing off humans for a tribal game, I learned that Kamen Rider is no oridinary kids show even though for Japan it is, if that was in America it would have a different rating.
To answer any questions, yes I did see Saban's attempt at Kamen Rider as a kid before knowing of the franchise. The only thing i remember from Masked Rider as a kid was the team up with MMPR in the Friend in Need episodes. I was interested in him when I first saw him, he looked was different than a Power Ranger and he had an awsome weapon. I looked back at the series with knowing of Kamen Rider and wow i hated it sooooooooo much. Masked Rider was campy even more than Power Rangers with a bad main lead a little furry thing and villians that I didn't care for at all. I didnt start with Black RX after that because i found that it was a sequel to Black. Black was amazing one of the best of the franchise still i loved it. Black RX is great as well, but cannot compare to the original imo.