Correct me if I'm wrong, but there seems to be a general consensus that forts are pretty rubbish.

In certain circumstances (where there are serious choke points) I've found them really useful. Especially when an enemy is throwing huge waves of armies at you, you can stop them constantly beseiging your cities and interrupting your production and at the very least buy yourself time before they get through.

Everything I've found on the posts have slated them. Does anyone else use forts heavily?