Well yes and no. To be honest, I have watched several episodes from the series from the 70s and 80s, and right now, I just have not been able to get into anything before Liveman. Flashman and Changeman have great ideas, but the majority of the first 10 episodes (all that I have seen from either) have been okay (well eps 6 and 7 to Flash are terrible). The others before it though have been horrible. Actually, it is really hard for me to get into the series that run 25 minutes and I do not know why. It just feels like the episodes are two hours long, especially Dynaman. Of course, Bioman is 19 minutes but that was pretty lacking as well. It started out good, had some interesting events occur, but in the long run, I was not impressed at all.
On the other hand, it would be interesting to watch them subbed, as some of my friends would be willing to watch them.
I think part of the problem is that a lot of people just don't know certain shows are being subbed. Most people only head to TV-N and think if it's not there, then it hasn't been subbed.
I think the problem is that Nihon is the only one that sticks to subbing them. Harorangers subbed like 11 episodes of CarRanger and then stopped. Not just that, but getting episodes to download from other sites is a pain. I had to spend like 35 minutes just trying to download Haro's first several episodes of Car because the links did not work. Not to mention there is no audio when I play them on my PS3 or Blu-Ray player.