Here's why I hate it:
1) Icons on Quick Access Toolbar are tiny and very difficult to see.
2) You have to make a QAT for EACH mode of Creo - part, activated part in an assembly, activated subassembly, assembly.
3) The Smart box has been moved to the bottom right. Everything else is up at the top. Why????
4) Assembly mode no longer has Mate and Align. Creo now defaults to . . . whatever it darn well pleases. Sometimes it's normal, sometimes, it's distance, sometimes it's coincident.
5) Every command is now buried in a tab - one extra click that I shouldn't have to do. I shouldn't have to create a Quick Access Toolbar.
This is just a start.