Anecdotally, we get much more positive feedback about the tone and copy than negative feedback. It's certainly possible we're just not hearing the negative feedback, but we get plenty of other negative feedback about other things, so this would be an unusual blind spot.

The tone of the project itself is similar to the tone of the site, so if you find it off-putting or believe your co-workers would find it unprofessional, the product may not be a great fit for your environment anyway.

We also haven't heard feedback about anyone having difficulty convincing others to try Phabricator because of the project's tone. Again, it's possible we're just not aware of it, but we have heard feedback about other issues in this vein (for example, the LAMP stack being a hard sell).