These threads evolved haphazardly, without hard and fast rules. "
Random Movie Thoughts" used to be a thread for movie reviews as well as... well, random thoughts, until Frink (IIRC) objected, and now we have "A Few Reviews", but also "2017 Movies", and we have a "
Random TV Show Thoughts" as well as this "New Shows" thread. Like Hawkeye said, None of This Makes Sense.
That said, if you read through this thread, you'll find that straight-up descriptions of shows without reviews or even commentary ("I am/am not excited for this for [x] reasons") is pretty much non-existent. Pretty much all threads on this board, with the arguable exception of the "What are you listening to at the moment", contain a measure of commentary by default. Bottom line, IMHO, is that if you have time to post about a thing, you have time to make at least
some substantive comment about the thing, even if said comment is as minimal as "hey, this really interesting, but it hasn't aired in my country yet", or "I've been watching this show, and am not sure if I'll continue; could go either way for [x] or [y] reason." A handy rule of thumb, for me, is "is my latest post noteworthy or interesting enough to earn the clicks, new tabs, and time spent by fellow posters reading it, as well as sending it to the top of the recent posts pile?"