I sort of forgive them the mistakes of the first two seasons, as I believe that was Imavision's first major DVD release. They were quick to address most of the issues. The two specific problems were:
No title sequence on most episodes
No captioning
They fixed both problems from season 3 onward. Unfortunately, the episodes are cut. They are syndication prints, and there is a lot missing. Also, the image quality is not great. Sometimes, it looks much better than it does on TV in syndication. Other times, it looks like a VHS dupe.
You used to be able to find a list of cut scenes here:
http://www.imavision.com/lhop/eStore...meNoFlash.html
It was in the Community section. It may still be there if you sift through one of the sections. Since I last read around the time S3 came out--and since it has the most posts--I'm guessing the lists are at the back of the "LHOP in General" section.
By the way, I stopped buying after S3. Part of it was the quality, part of it was the fact that I had seen the complete Little House twice shortly before the discs came out, and I wasn't in the mood to watch what I had. I may pick the rest up at some point, but I do wish they would be revisited with remastered, uncut prints.
Edit: Here's a pretty good thread that will run down some of the problems for you, along with Imavision's response.
http://www.imavision.com/lhop/eStore...oMessageID=269