GoDaddy's WYSIWYG editor is great, striking a nice balance between ease and flexibility. For background, I've used iContact, Constant Contact, GoDaddy and Mailchimp. I find mass mail sites either box you in with pre-fab, static templates (Mailchimp) or add so many customization options that it complicated the email crafting (iContact). GoDaddy hits a happy medium.
Outside of the email content editor, GoDaddy Email's workflow isn't great. It mimics the iContact method of having you choose a list and subject line as the very last step before sending - almost as an afterthought. Your subject and audience are the two most crucial email items, arguably more important than the email content itself. I much prefer Mailchimp's process where you determine your audience and subject first, then review them at the end on a preflight screen.
I also find that GoDaddy emails end up in spam folders more often than those sent by iContact or Mailchimp.
I would include GoDaddy in the suite of mass email vendors you compare, as prices and systems are constantly changing. Plus, it's always good to have at least one backup mass email vendor, so you still have a conduit to send company messages if your main method has a performance or protocol issue that blocks you (system downtime, billing, lists, etc).
I have used GoDaddy as an option to send mass emails and track engagement. It provides the usual email vendor benefits of keeping me informed of opens, bounces, etc. as well as keeping my lists organized and a record of messages sent (which is important for audits).