At first sight this is a great plugin with some awesome features. In some cases such modules based plugins (plugins in plugins) really make sense. In some cases, not on every site!
Issues I have with this plugin and also think these are general problems of Jetpack:
- Main interface/ design doesn't match the WordPress interface - more like an "App" within WordPress. This is inconsistent and for CMS-like projects really NOT WANTED!
- Privacy/ data protection issues: especially effecting the Stats and Comments modules plus the Akismet integration --- for countries within the European Union (and maybe other regions of world, too!) this means you cannot use Jetpack (at least these mentioned modules) or you have to use workarounds for Opt-In/Out handling and/or legal notices.
- Especially the data protection issues are a problem for any company/organization site in Germany/ European Union, as these have to explain where stats & comment data goes and what happens with that.
- Required WordPress.com account/registration which cannot be explained to clients why they would need this for most of the modules?!? --- It must be possible to reach "feature parity" with WP.com without an account there. At least that's my opinion on this!
- Language pack handling is a desaster for some languages, take for example German: the community translations are nice in theory but not in practice. And also, they got overridden on every plugin updates (and there seem to be lots of them, esp. bugfix releases...). --- A simple feature with update-secure translations files paths would go long way :-).
- Auto-activation of some/all modules? Still not clear why and how this happens... All should be deactivated by default and user should just enable what's needed.
- Re-connection with WordPress.com is required after each deactivation/re-activation of the Jetpack plugin. Don't know why this behavior? -- Just let the connection stay and just include a big red un-install button, so admins could decide when to cut the connection...
What frustrates me the most, is, that such a plugin was released by Automattic - the company behind WordPress! Nothing against Automattic, really, they do great work in and out of/for the WP community! --- But I would have expected a more standard compliant plugin in the way of the user interface and some other aspects. In the current state this plugin does not work as a role model for developers.