Thanks for the details on these bugs; none of them has affected me, but that doesn't change the fact that Samsung should be fixing them.
I've owned Samsung, LG and Lenovo Android devices, and the Samsung devices have all been quite bug-free compared to the Lenovo (a short-lived foray into Android for that company that did not go real well for them). I haven't asked much of the LG device so it's hard to say. I hope the Sony stuff exhibits fewer bugs, for their owners' sakes, but they really don't offer any hardware that I find compelling. Each to his own, obviously.