There's not really much point in me reviewing any Studio Ghibli films other than to be yet another voice extolling their many wonderful virtues; most of them would probably get 10/10 anyway! Something that's much harder to do is settle on a Top Five. I haven't yet seen every single one of them, admittedly, and I may have to amend this list accordingly once I have, but I've seen most of them and only one was anything less than overwhelmingly wonderful. In fact, I'd even go as far as to say Ghibli films should have their own category, so superior are they to all other animated films, anime or otherwise.
Part of the reason for this is their unmistakable style, thanks largely to the amazing dedication of key man, Hayao Miyazaki, who has directed and/or overseen many of their productions, the consistently extraordinary quality of which has seen the studio dubbed the 'Disney of the East'. Their films tend to have noticeably higher production values and audio/visual quality than most other anime - the soundtracks are usually original compositions and Miyazaki-san overwhelmingly favours hand-drawn animation over the use of computers. He personally checks countless thousands of hand-drawn images and he often draws many of them himself as well.
Most of the films share certain basic themes too. Many feature a young but ultimately strong female lead, usually undergoing some sort of right-of-passage or coming-of-age transition. They also rarely fail to feature at least some otherworldly spirits of some sort, and there is usually an element of pacifism as well. However, as much as you might be able to analyse the films, their characters, the themes explored, etc, doing so is far from necessary to gain immense enjoyment from watching them and being drawn into their respective worlds regardless of age.
So, as hard as it was to settle on only five films to include, if you haven't seen any of these, do yourself a favour - don't dismiss them as childish or unrealistic, just watch them. And then thank me! :)
5. Howl's Moving Castle (2004)
4. Kiki's Delivery Service (1989)
3. Ponyo (2008)
2. My Neighbour Totoro (1988)
1. Spirited Away (2001)