I don't disagree fully with you, but these stutters you speak of don't seem to affect me the same. I agree Samsung needs to do better on software, but it is slowly but steady. You don't see these problems on Motorola phones, for example. Why? Because they leave the software to the experts, Google.
Now, that doesn't help you if you want a Samsung phone. But, just like my s6, once I get the note; I'll disable bloat (not a lot on T-Mobile phones), adjust my settings (like wifi scanning and etc), replace the launcher and some of the stock apps, like the messaging apps, with better alternatives in the play store. As such, I rarely saw problems or stutters on my s6. The battery life was poor for me, I expect that to be less of an issue with the note. Honestly I have had more reboots with my iPhone lately, which is weird. I have tried a reset, etc. my iPad Air 2 does run flawless though, and is still the best tablet experience; imo.
Maybe I have a higher tolerance, since I used android before iOS. But to me the situation is similar to what I am seeing with Windows and OSX. Windows was inferior to OS X until Windows ten....kind of like android and iOS until lollipop. Android M only furthers this argument, IMO.
I still just recently bought a Mac, because it has the best hardware combo imo. Haven't had time, but i plan on putting Windows ten on it shortly.