Akira Toriyama is considered by many to be one of the best manga artists, inspiring many others. I have sort of split feelings about his work. My first exposure to his work was Dragon Warrior (Japanese released as: Dragon Quest) a role playing game for the Nintendo Entertainment System (Famicom in Japan). I did not associate that with him though; what I did associate with him is the dubbed version of Dragon Ball Z on Fox network. I did not like Dragon Ball Z, this in turn has colored my opinion of his works. Judging a manga artist on a translated, edited, and altered medium is really not a fair way to base his work.
I recently re-read his short work Cowa! which is about a kindergarten age vampire/were-Koola named Paifu, his friend a ghost named José Rodriguez, his rival Arpon, and a retired Sumo wrestler. The plot is very simple, the many monsters of the village are getting sick and Paifu and friends make a trip to get the medicine needed to save them.
I found this manga very enjoyable, having read it more than once, the online version as well as the VIZ version. It's a pretty funny manga. What I particularly like is that in a village of monsters the most scary being is the human. If you look at some of the stuff humans do and have done in the past it seems apt that a human would be scary, plus there is the monster story staple of humans hunting monsters (Frankenstein, Dracula, etc.).
While I like longer series, for the simple fact there is more of it to read. In many ways I like short one shots more. One of the reasons is it is much easier to acquire one book than many, another reason being it is a complete story that can easily be read all at once.