In reply to Terence Milbourn.

Keep in mind that the languages folder in the Jetpack takes up 4 of the 7 MB in the ZIP file. The plugin is not actually larger than WP. The large file size is a WordPress issue, not a Jetpack issue. Pretty soon, that'll be a problem of the past because WordPress.org will allow translations to be downloaded directly from the site rather than plugin authors having to package them in their plugins.