That's something of a joke. The third Star Trek movie was The Search for Spock and it was pretty decent. The only original cast movie that has absolutely no merit is Star Trek V. While The Motion Picture was dull as dishwater, the premise was actually good and it could have been great had they cleaned up the script and trimmed out the fat.
There were four TNG movies and only one of them, First Contact, was good. The worst one was Insurrection with Nemesis coming in at a close second. I was sad the TNG movies ended on such a disappointing note.
Think First Contact is still my favorite Trek movie, IV probably the next.
Found the movies a bit dull generally as a I and I didn't know who Khan was in Wrath of Khan.
I watch Trek not because I'm a trekkie but generalky like Sci Fi.
Hence whi I said it's batting 50/50 approx. Alot of Sci Fi has better season 1s or maybe the bad stuff didn't make it here or we didn't watch it.
My theory is trekkies have a high tolerance for pain or will watch anything Trek related
TNG was 50/50 really good or bad, DA9 was good Voyager, Enterprise meh, Discovery season dependant, Picard season dependant, SNW good.
Movies might not even be batting 50/50 2 good ones first 6, 1good TNG movie, 2/3 new ones? Liked the first new Trek one.