1st season was by a large a massive let down for myself, but I was so desperate for new weekly trek that I gave the show more time to find it's voice then any other tv show to ever air.
But it did have a few episodes I really liked or loved, and a few elements on the production end that I really enjoyed.
From the get go, the music was fairly solid and thankfully having original scores each week meant that we didn't have to reuse themes, something I strongly dislike. For example TOS romance theme, using the same theme each time makes it appear that each woman is loved or desired to an equal degree something that is absolutely not what my experience has taught me, same with danger, etc, even some of the weakest episodes had a solid score.
The cinematography of the first two seasons was really strong. Most of the other elements of the production from set dressing, costumes, makeup, and visual effects were fairly weak in my opinion. I really was extremely happy when Thesis stopped doing costume designs for TNG, while his work in the 60's was great and reflective of elements of it's time. I didn't really see any growth, it felt like the show could have occurred as the 4th season of TOS. FX work, was really weak, and I love model work, but they had a limited staff and were always out of time, getting rotating crews for the 2nd season, and expanding even that later in the series run did wonders for the work the fx crews managed. Though I do admit there are two shots that really did work great done in the 1st season and both done in the same episode, When the Bough Breaks. The shot of the Enterprise being flung away from the planet seeing it spin, and then the power source for the computer which was a tiny model, but done so that it appeared as a massive structure. the one aspect of the fx that I thought was pretty solid from the get go, was how they farmed out the matte paintings. Set design and set dressers did great work with The Big Goodbye but i wasn't impressed by the work for the 24th century.
Episodes that I thought the majority of departments were doing great work were Where No One Has Gone Before, The Big Goodbye, Heart of Glory, 11001001 and Conspiracy. I also thought Datalore was a 3 out of 5 star episode.
Everything else I would rate 2.5 to .5 starts. though most episodes did have at least a scene, or a character beat, or a concept that I enjoyed, just the overall final product wasn't appealing to me. Now I ended up loving TNG, but its first year is for myself the worst first season of any Trek outside of the Animated Series (which even as a kid I never really liked).
Oh one other thing I want to give a shout out to for the first season and that was the fairly new director Rob Bowman, who ended up being one of my favorite trek directors and my favorite director on the x-files. I love his work even in terrible episodes.