I guess the experience depends on the hardware as well. For me, F-12 is a major regression:
- 3D graphics doesn't work without KMS
- 3D graphics + KMS + hibernate/thaw or suspend/resume crashes the system
- my network keeps disconnecting
Yeah, I got hit big time, because I have Intel 945GM/GMS graphics and Broadcom BCM4401-B0 NIC. So, several times a day, I have to start my network card again. And, of course, I have to suffer through slowness of 2D and metacity, instead of having smooth 3D graphics and compiz.
YMMV, as they say. But, I'll suffer through it until it gets fixed - it's not the end of the world.