The original acting was pretty bad as well. Not to mention the sets, the entire premise (Really, the Captain, First Officer and Chief Doctor of a star ship beams down to $random planet in T-shirts? What Starfleet manual did that come out of?).It was the time and place that made Star Trek what is was. This was 1966. We hadn't made it to the moon but NASA was on a roll. 2001 hadn't even hit the screens.
The stories really don't age well, the characters really don't age well and we sure the hell didn't age well.
Ultimately, that's the problem. I thought the original Star Trek was great. But, it was 1966 and I was 12 years old. In reality, the "good old days" never actually existed and they weren't actually as good as we remember them.
A faithful re-creation of the original Star Trek is NOT a good idea. There simply have been too many advances in the last 40 years. The cheap sets, cheesey special effects and bad acting just aren't tolerable any more.