Interesting (and I think generally accurate) review of the series from a comment on RuTracker (transkriptase, Jun 13, 2014):

[The summary says] "Introduces children to the simplest concepts of the world around them."

Lol... this cartoon will "introduce" them all right... I can't stop laughing... Still, this one should be watched by those who are not so young, who will understand where the cartoon characters are, so to speak, not in the right. :)

But generally speaking, I recommend this most of all to adults - children's psychology is shown very subtly, and at the same time without any tediousness and with humor - where else can you find something like that? ;)

However, I don't remember the last two cartoons very well - I deleted them from my hard drive when I downloaded them last time. I was very disappointed. Unlike the first ones, they seemed to be just empty and stupid fuss. I'll watch them again now. Maybe I'll delete them again. :) Or maybe not...

But the first three (or four, since the third one is "two in one") are very good. Especially the first two, where Long Ears himself narrates everything that happens. But the following "two in one" cartoon is also excellent, you keep seeing real children instead of animals. :) Moreover, although all the characters start talking in their own voices [in that film], they are voiced by the same actress.
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Downloaded them, watched them. Well, the impression from last time was correct. The last two cartoons are total stinkers. It is as if other people made them under the name of the previous authors, clumsily trying to plagiarize and repeat the style of the original.

But they apparently misunderstood something. For one, that the previous cartoons had meaning, and were not just about fooling around with doll figures. [In those last cartoons] they came up with meaningless and relentless crap.

My own impressions are similar - the first two are very good, the third isn't as good, and the last two are terrible, despite being made by the same creative team. They also changed the puppets, and Long Ears started looking far less charming.