I've got an iCloud IMAP account and 5 Google Apps-hosted (Gmail-based) IMAP accounts. This problem does not affect me very much. Messages seem to arrive properly - unless I first receive them in another email client, such as on my phone. If I receive an email on my phone, the message does not appear immediately on my Mac in every case. That's where the frustration comes from. Other than that, this problem is minimal for me.
2/4/14 at 12:13pm