As you might know, VBR7 was launched late this August and since then many hundreds of customers were posting numerous bug reports on Veeam's forums. I, myself, happen to be their customer and I decided to track the most critical bugs before I migrate my clients to a new version. So, this is my list, please, add what you think are other critical bugs, that I didn't mention.
http://forums.veeam.com/viewtopic.php?f=2&t=17224 - Critical issue and poor handling by support: it is a known issue in the old version of this software and you can see that posts in this thread date back to 2009. One might've expected that they'll deal with this issue in the new version, but, unfortunately, it is still present. Very dissapointing.
As for Veeam tech support, one thing I noticed is that they were flooded so badly with bug reports this August-September that the only answer one could've gotten from them was: "Please, go read about this in the Knowledge Base on our website". I've seen tons of replies like this on their support forums. Not very helpful, obviously, if you have a pressing issue and need a solution right away.
http://forums.veeam.com/viewtopic.php?f=2&t=17872 - Complaints on BS called "WAN accelerator": they've added a new useless gizmo that became a problem in itself causing new complaints. Why add new buggy useless feature?
http://forums.veeam.com/viewtopic.php?f=2&t=17887 - Poor Performance on File verification and againg support send the customer back to User Guide. Yeah, right
http://forums.veeam.com/viewtopic.php?f=2&t=17597 - Random errors are usual thing for a new complex software, but with VBR7 one just gets too many which is frustrating. You get the error, go to their tech support forum and there they say to review the docs again. OOOOOOOOOOk!
http://forums.veeam.com/viewtopic.php?f=2&t=17898 - Dropped support for still quite popular W2K3 x64 (this can be expanded to a problem with upgrade at Customer's site, who wants to backup to tape, etc)
These are the most critical bugs and issues, as I see it.
If you noticed other critical issues, please, comment, add you feedback here or in my blog:
http://vbscs.wordpress.com/2013/09/13/veeam-backup-replication-7-total-disaster/