I'm sorry but what you call "original series" is the second series, the first Tamagotchi was released in 1997
Anime tv de hakken Tamagotchi (1997-1998)
Tamagotchi! (2009-2012)
Tamagotchi! Yume Kira Dream (2012-2013)
Tamagotchi! Miracle Friends (2013-today)
If we consider the web animes too, the list is
Anime TV de hakken Tamagotchi (1997-1998)
Let's go Tamagotchi (2007)
Tamagotchi original animation (2008)
Tamagotchi! (2009-2012)
Tamagotchi! Yume Kira Dream (2012-2013)
Tamagotchi! Miracle Friends (2013-today)
I liked all the anime shows, but I only watched 2 episodes of Yume Kira Dream and 1 episode of Miracle Friends, because I can't watch them on my Wii, that's really sad that nobody subbed them, even an anime like PPGZ have been subbed, and I don't understand why, since it's really childish and girly, and who made it just ruined the Powerpuff Girls, PPGZ is the worst magical girl anime I watched, in my opinion Precure is better, someone even English subbed the Japanese dub of MLP, and I don't understand why, since it's an english-speaking cartoon, and I really dislike the Japanese dub.
The Tamagotchi anime is really well made, and after 4 years from the release of Tamagotchi! I still ask to myself the absence of subs, same for the second movie...
I think many could relate to the characters, the characters have similar things to must of us, and the episodes' plots are really well made, they're cute, funny, fantastical, and sometimes even touching, with similar feelings and situations of our lives.
Am I the only person who believe that most kids anime are more realistic than teen-adult anime such as Naruto and One Piece?Most kids anime such as Doraemon, a kid can relate him/herself to the main character Nobita, to his life and his relationships, same for Tamagotchi, but not only kids can relate to the characters, but adults too.
Here in Italy most otaku said that the Tamagotchi anime looks like something for kids only, they judged it before watching it, they only looked to the cute characters saying "it's a stupid cartoon only for kids", well Happy Tree Friends are cute too, but they're not for kids, they think cute= stuff only for kids, but that's not true.
Doraemon is Japan and Japanese animation's messenger, and Doraemon is a kodomo manga and anime, so who judged a kids anime or manga only for kids before reading or watching it is an idiot...