It sounds as though a lot of people find his altmode doesn't fit together and/or that his feet are floppy and he won't stand up. I assume, given the diversity of reaction, that he's very QC-dependent.
Mine holds together well in car mode and the feet are fine, but he falls apart easily. The doors, front wheels, and hands pop off easy during transformation.
That sounds terrible, but given that a good 60% of the figure is brand new, there's a very good chance those issues have been fixed.
After five movies, I've got franchise fatigue, but finally doing justice to Bumblebee's '76 Camaro mode is enough to get my attention.
No 70s Camaro TF will ever be better than '07 Cliffjumper and his horrifying skull face.