+1 Email notification sound playback is buggy
+1 Screen glitches when answering calls (annoying)
+1 Video recording and playback not smooth (was better with 1.1)
+1 When FM transmitter enabled, it sometimes plays music through speakers at random time for 1-3 seconds
+ RingTone playback buggy

Opinion of 1.2 ? Made my experience with n900 worse...