[enigmango]

But what about the three-word sentence "I communicate well"?

More seriously, the most that reading "I'm a good communicator" tells me is that the writer can form sentences reasonably.

Succinct? Sure, but it's still so broad. When I'm working with someone, I would appreciate a troubleshooting message of "The Flob server is saying clients don't have the right Gruffin anymore." instead of "Flob isn't working."

Obviously this depends on context, but choosing where to be succinct is key. My project manager would much rather hear "Flob is down for half the users - we'll have a patch tested and deployed by tomorrow afternoon" than "Flob broke, and we're fixing it".

"I have a proven history of writing clear and efficient end-user documentation" and "I'm someone people enjoy bouncing ideas off of" give me more confidence in someone's communication skills than "I'm a good communicator".