WOW I use to watch this show on reruns .......but if the PQ is that bad I am going to skip it. My favorite episodes is when they did the marathon speed cases when Dan was doing it by the pound :P
I may not have been clear; Seasons 1-3 are fine. I bought them when they first came out and they are worth the money. Once they got started though, they must have found that it wasn't profitable enough and they switched to manufactured on Demand for the remaining seasons. If you liked the show, you should absolutely buy seasons 1-3, I just wanted to make sure knew what they were getting into if they were completionists.
One other word of warning, I would highly reccommend not buying Season 4 from a secondary source (either buy it direct from Amazon or WB Shop). The first run that they did of season 4 had huge audio issues (as in the audio didn't match the video). They've fixed it since then, but I wouldn't take the chance buying it secondhand.
Finally, here's an amusing side story. The first season on DVD was released in 2005. I bought it when it first came out, and it had a pamphlet that said "Purchase 3 WB TV Seasons (from the select list of titles) and send in for a rebate of $20(?)" Three of the titles listed included Night Court Seasons 1,2, and 3. The promo lasted for two years, which was why it had future releases listed on it.
Season two came out in 2009.