^It was good. Harked back to season 1 & 2. Did they change cinematographers in the latter seasons? The film quality in 5, 6 & 7 doesn't seem as good as the first four.
Yes, TNG had three main cinematographers during its run: Ed Brown (S1-S2), Marvin Rush (S3-S5), and Jonathan West (S6-S7). Brown used Eastman Kodak 5294 & 5295 which were 400 ASA stocks and he also used a lot more light on set compared to his successors. Some of this is discussed on the Directors panel special feature on the Season Seven set.
When Rush took over, Kodak had just introduced one of their first partial T-Grain stocks: 5296, which was rated at 500 ASA (more light sensitive) and so the show switched to that and he was able to use less light (and those terrible photo black cards went away on the bridge's aft stations). West used the same stock, but again, as the show went on they used less and less light and opted instead to push process the film during development which brings out more detail in the shadows but also increases the amount of grain.
I think overall, West did a pretty good job of matching Rush's look for the show. The main difference is he added a diffused Kino light just below the camera lens to fill in shadows on the actors faces and to add a catch light to their eyes. You'll notice that they have a sort of flattering glow to them in seasons six and seven. Helps with wrinkles too.
West used this technique on DS9 as well. You can see the Kino light on the right in this shot
here.