My reasons to hate XML:

- element vs attribute ambiguity

- model of the document does not fit nicely to programming model of structs, dicts and arrays

- too many complexities (entities, cdata, parser directives)

- cardinality unknown without schema (is that a single value, or an array that just happens to have one element)

- order of elements may or may not be significant depending on schema

- not really extensible if the original schema does not explicitly allow for extensibility

- some types of valid XML documents are not representable by a schema (e.g. any number of different elements in any order)

- verbosity

- namespace identifiers being URIs that may or may not be resolvable

What I want for general data exchange is JSON with comments and sane namespaces.

Edit: line wraps