1. the message builder is buggy and slow
2. the site, in general, is very slow
3. When I create a segment and before I sent an email I cannot see the specific list of email that belongs to the segment
4. I don't have the ability to create a segment by uploading a list, for example in my database we have users who claimed a specific deal I can export them from my system to send them a message but when I import them to AC I am unable to just send an email to them. To create a segment I have to add a tag then create the segment which makes you have loads of silly tags that are harder to manage. With Mailchimp, I can upload a list and create a segment from the import alone
5. SMS is not too functional I have been unable to make it work
6. Fields and lists, it looks like every list and every contact on all lists have the same fields. I have merchants and users, they have different attributes it is annoying that I end up with massive lists of fields that don't apply to every list.
7. Point above becomes worse when you use forms, each form creates fields for ALL LISTS arghhhh Review collected by and hosted on G2.com.