Okay so it seems like a lot of people these days just don't regard the original series that highly. With the exception of the 3rd season(which in it there are still episodes which are worth watching) the original series is my favorite star trek show and maybe even my favorite sci fi show. This is because there's a certain charm to this that was never replicated by any of the other shows(this is also helped by the fact the show never took itself too serious like tng), also the pacing and music are not bad, and despite what many believe the acting isn't bad. In fact spock and McCoy are played by amazing actors are some of the best characters in sci fi. another criticism I often here is its too old and cheesy but if any ones learned any thing from watching the twilight zone is age doesn't equal quality. there are some cheesy moments but again with the exception of the 3rd season this isn't too bad and in some cases helps the humor and charm of the show. the high point of the show is the writing and the character interaction which are both great. also most people regard the next generation higher but compared to tos its rewatch value is considerably lower due to it not having aged as good as tos. another thing I often hear is many people watch the original series movies and skip tos for the reasons above. but despite the tos movies mostly being great they are much better if you watch tos first. Lastly most just say that tos is only good for nostalgia and are to boring for younger audience but this is untrue because I first started watching them 2 years ago at the age of 14 and compared to other trek shows it has the most action and seasons 1 and 2 have some of the best episodes in all of sci fi which definitely out way the few bad filler episodes. if I missed anything or have an thing to add please reply below.