Essential Drupal 8 modules
Redirect - we need redirection if the title of an entity changes. Very good for search engine optimization and being able to contain links coming from outside.
Redirect is currently (2017-05-06), breaking the Drupal 8 site.
Google Analytics - we need to track what is going on.
Pathauto - we need search engine friendly titles on our articles and pages populated automatically.
Single command to download and enable modules: drush dl redirect, google_analytics, pathauto; drush en redirect, google_analytics, pathauto
Nice To Have Drupal 8 Modules
video_filter - very nice filter to embed videos in your posts.
drush dl video_filter
Experimental from Drupal 7
drush dl devel, ds, boost, httprl, captcha, ctools, db_maintenance, token, pathauto, google_analytics, jquery_update, xmlsitemap, expire, imagemagick, globalredirect, module_filter, lazyloader, linkit, logintoboggan, pathologic, video_filter, extlink, image_allow_insecure_derivatives, transliteration, mostpopular -y