My Hayao Miyazaki Rankings:

My Neighbor Totoro
Spirited Away
Princess Mononoke
Howl's Moving Castle
Nausicaä of the Valley of the Wind
Ponyo
Castle in the Sky

Wonderful

Princess Mononoke
Spirited Away
Laputa: Castle in the Sky

Good

My Neighbour Totoro
Howl’s Moving Castle
Nausicaa of the Valley of the Wind
The Wind Rises
The Castle of Cagliostro

Meh

Porco Rosso
Ponyo
Kiki’s Delivery Service

[deleted]

Here's mine:

Kiki's Delivery Service
Nausicaa of the Valley of the Wind
My Neighbor Totoro
Spirited Away
Howl's Moving Castle
Princess Mononoke
Castle in the Sky
Castle of Caligostro
Porco Rosso
Ponyo
The Wind Rises

This is wholly based on my enjoyment, not necessarily what's the "objective best":

Nausicaa of the Valley of the Wind
The Castle of Cagliostro
Princess Mononoke
Porco Rosso (his most underrated for sure!)
Castle in the Sky
Kiki's Delivery Service
Howl's Moving Castle
My Neighbor Totoro
The Wind Rises
Spirited Away
Ponyo (need to rewatch this-- have not seen it since its original run in theaters)