I suspect that viewers that are influenced more by 'esoterics' (special effects, realism of sets, etc.) will be distracted by those factors while those who are interested in STORY will like TOS.
I think that's true in any era, but in terms of visual appeal the bar has been moved or raised. What was once accepted as state-of-the-art and then tolerated for several years is no longer acceptable anymore for the broader audience.
Today it's rare that something visual on the screen will wow me simply because I know that there's very little they can't bring to life onscreen. From that standpoint I need story and characterization and ideas to engage me. If those aren't there then no amount of eye candy will hold me.