1) Camera performance is no where close to the expected standard and needs to be fixed before they release the final version. Especially the front camera!
2) Battery performance is poor since the new beta version began.
3) Game performance is absolute worst. Games freezes every now and then, & the notification bar pops up while playing which is a real big distraction.
4) Ram management is so poor that if the games are minimised for even few minutes the progress is lost and the games are refreshed. Same is true for some of the other apps too.
Most of the other bugs are minor ones that can be fixed, but Samsung really needs to focus on these areas seriously!