As far as I know there have been 3 region 1 releases of TNG on DVD:
1. The original individual season releases from 2002, all of which were packaged together for a complete series release in 2004 - https://memory-alpha.fandom.com/wiki/Star_Trek:_The_Next_Generation_-_Seasons_1-7
2. A complete series release in 2007 - https://memory-alpha.fandom.com/wiki/TNG_Complete_Series_Boxset
3. Another complete series release in 2016 - https://memory-alpha.fandom.com/wiki/Star_Trek:_The_Next_Generation_-_The_Complete_Series_(DVD)
They contain 48 DVDs, with the 2007 release containing a 49th "bonus" disc, and they mostly contain 4 episodes per disc.
4 episodes per disc is pretty typical for 1-hour-time-slot shows released on DVD, but they are normally DVD-9 discs (double-layer / ~7.92 GB capacity). I just got the 2016 release in the mail and they are on DVD-5 discs (single-layer, ~4.38 GB capacity), which is utterly absurd.
I'll use the TOS DVD releases as a point of comparison. The original releases that started in 1999 were on DVD-5 discs, but they only contained 2 episodes each. Each episode was a little over 2 GB, which is acceptable in terms of bitrate. The complete series release in 2004 used DVD-9 discs with 4 episodes each. That allowed for up to about 1.9 GB per episode, which isn't quite as good as the 1999 releases, but still acceptable.
Back to the TNG episodes in my 2016 box set: they are only around 1 GB per episode which is definitely not acceptable for MPEG-2 compression. This is a blatant case of them being cheapskates (DVD-5 discs are cheaper than DVD-9 discs).
I know the TNG picture quality is inherently poor because they were transferred from Betacam SP rather than 35mm film elements, but that doesn't mean they should make the problem worse by starving them of bitrate. Since I often watched this show when it originally aired when I was a kid, there's a nostalgia factor to the look of a TV broadcast from a Betacam master tape (especially on a CRT TV like I use), but there is no nostalgia whatsoever for digital compression artifacts caused by low bitrate. Betacam SP was an analog format so it had no compression artifacts, and NTSC TV broadcasts were also analog, so they didn't add compression artifacts either.
My question is: are the 2002 and 2007 TNG DVD releases also on DVD-5 discs? If you have one of the earlier releases and a Windows PC with a DVD drive, the way to tell is put one of the DVDs in and look at its icon in "My Computer." It will say "0 bytes free of X GB," like this:
If it's over 4.38 GB then it's a DVD-9.
1. The original individual season releases from 2002, all of which were packaged together for a complete series release in 2004 - https://memory-alpha.fandom.com/wiki/Star_Trek:_The_Next_Generation_-_Seasons_1-7
2. A complete series release in 2007 - https://memory-alpha.fandom.com/wiki/TNG_Complete_Series_Boxset
3. Another complete series release in 2016 - https://memory-alpha.fandom.com/wiki/Star_Trek:_The_Next_Generation_-_The_Complete_Series_(DVD)
They contain 48 DVDs, with the 2007 release containing a 49th "bonus" disc, and they mostly contain 4 episodes per disc.
4 episodes per disc is pretty typical for 1-hour-time-slot shows released on DVD, but they are normally DVD-9 discs (double-layer / ~7.92 GB capacity). I just got the 2016 release in the mail and they are on DVD-5 discs (single-layer, ~4.38 GB capacity), which is utterly absurd.
I'll use the TOS DVD releases as a point of comparison. The original releases that started in 1999 were on DVD-5 discs, but they only contained 2 episodes each. Each episode was a little over 2 GB, which is acceptable in terms of bitrate. The complete series release in 2004 used DVD-9 discs with 4 episodes each. That allowed for up to about 1.9 GB per episode, which isn't quite as good as the 1999 releases, but still acceptable.
Back to the TNG episodes in my 2016 box set: they are only around 1 GB per episode which is definitely not acceptable for MPEG-2 compression. This is a blatant case of them being cheapskates (DVD-5 discs are cheaper than DVD-9 discs).
I know the TNG picture quality is inherently poor because they were transferred from Betacam SP rather than 35mm film elements, but that doesn't mean they should make the problem worse by starving them of bitrate. Since I often watched this show when it originally aired when I was a kid, there's a nostalgia factor to the look of a TV broadcast from a Betacam master tape (especially on a CRT TV like I use), but there is no nostalgia whatsoever for digital compression artifacts caused by low bitrate. Betacam SP was an analog format so it had no compression artifacts, and NTSC TV broadcasts were also analog, so they didn't add compression artifacts either.
My question is: are the 2002 and 2007 TNG DVD releases also on DVD-5 discs? If you have one of the earlier releases and a Windows PC with a DVD drive, the way to tell is put one of the DVDs in and look at its icon in "My Computer." It will say "0 bytes free of X GB," like this:

If it's over 4.38 GB then it's a DVD-9.