I prefer not to use them. It's bad grammar, it's unclear and it's lazy.
Besides that, most acronym-users seem to think that they have the only possible explanation for an acronym. Try to explain to the union of pot-smokers that you want the uninterruptable powersupply sent via universal parcel service.
The 'YAML' kind of acronym you refer to is the worst... even if you unpack it it's still not clear what it actually means. Those always give me a symlink-to-parentdir feeling. ;)