Hello,
The first most obvious issue is the change from having the different Sections being labeled and at the top of the page (Dashboard, Tickets, etc.), and making them Symbols and putting them on the left. It's not intuitive, nor does it match what you've done in the past. So every single old customer needs to re-learn your product.
Not only was that a very bad idea by itself, but then you take the Ticket Filters that used to be on the left, and move them to the right!?! WHY!?!?! It's like you hired another company that's NEVER used your product to write new interface code.
I'm not sure what your "Target Customer" is, but I use this to do work, not to look "Pretty".
Speaking of... Using the "Mint" interface requires a lot more scrolling in general compared to the original. Things are spaced a bit farther away from each other which makes me reach for my mouse a bit more, which is frustrating.
While in a ticket, the old interface had 2 things it displayed in the main portion of my screen. From left to right, the Ticket Replies which accounted for 4/5 of the screen, and the other 1/5 had the Ticket Status, Requester Info, and Ticket Properties all stacked on top of each other. Now that I've been Mint'ified, 1/16 are the lovely non-labeled Icons that do something, 9/16 are the Ticket Replies, 5/32 are stacked Ticket Status and Ticket Properties, 5/32 are the Contact Details (WHY!?!?!), and the last 1/16 are more non-labeled Icon that likely do something.
So, we went from 80% of the screen displaying the Ticket, the thing that you need to work on the most, to around 56%. You've out-right wasted roughly 22% by un-stacking Contact Details from the other Ticket Properties and adding 3 buttons on the right-hand side. Fixing those would get us back up to 78% of the screen being the main event, THE TICKET!
To deal with the left side of the screen with those buttons that are meaningless to me, the "Bots" button doesn't work for a non-admin. So why do they see it? When I don't have access to something, I don't see it.
PLEASE prove me wrong, and actually listen and do something about my issues.