I really don't understand how the developers or whoever can thing Marshmallow is better. Better than what? A landline? Perhaps better than a pager? Because for a CELL phone OS it sucks! I thought the update from KitKat to Lollypop was bad...and sadly I was excited for that one. I purchased my phone it worked AWESOME on KitKat. The battery lasted 1.5 days and that was with me using it. I heard so many good things about Lollypop I looked forward to the update after only having my phone for ONE MONTH...what a SAD, sad, sad day. The battery went to needing to be charged twice a day. Whoa! No changes in the way I used my phone, only changed how often I had to charge it, and no matter what I did, that remained the same...some other issues to, but was able to resolve most or just learn to live with them....again, looked forward to the next OS update...along came MM....wow, couldn't suck more than anything I've had done to any previous phone and that includes having a Blackberry. Why oh why do developers think they are making good changes when they are worse than the previous ones?????
1. Battery life is abysmal, I now need to charge the phone at least 3 or 4 times. Note these changes are not occurring gradually over time. They are right after the update and I've cleared my cache every time. I removed so many programs to even update the OS...programs I USED but still removed because I needed to clear space, for what, this horrible update. Hey, developers or whoever is making these terrible changes please stop messing things up that used to work.

2. I am the user of this phone, not some developer...why did you REMOVE the personalized vibrations on texts????!!! This was for me the WORST of the worst changes ever ... I do not, repeat NOT want the same vibration for my notifications, email and text and I don't want Suzy to have the same vibration as Sam. I want it back the way it was...the ability to have a text vibration for all texts, a vibration that is DIFFERENT for notifications, a vibration that is different for email. And I want to be able to have certain people have a different vibration for text and phone. It worked before so it's not like it can't be done. Whoever is the powers that be, put it back please I am not a happy camper with this.
3. What were you thinking when you made the phone constantly change to CARMODE when I start my car. I have my Bluetooth hooked up, so if I get calls I can answer them...there's no need for this CARMODE stuff to keep interrupting things. Thing is - it's whacked! I get into my car start my car and suddenly my phone is lighting up with the do you want car mode, I cannot even swipe it away...it just stays there lit up unless I actually UNLOCK my phone and then ON its own it starts to activate it. I don't think it makes it safer when you have to actually UNLOCK the phone...that is in fact a DISTRACTION. If it try to ignore it and then get out of my car after my car is OFF and I am walking away toward the house or store, or work, or whatever...when I unlock my phone guess what?!!! It still goes into *Carmode* WTF?! This doesn't even make any sense at all. Why is it doing it, well, because I never responded in the first place to the initial Carmode, but here's the thing...why should I have to respond. If this supposed carmode is a safety thing and you've made it so I cannot even turn it off without disconnecting my Bluetooth, then I should not have to perform an action for it...it should just be seamless and need no response, but since it does need a response, it should also be something I can disable. I don't want it. I like the old way --- the Bluetooth in my car automatically connects and I don't have to push any buttons, don't have to unlock my phone just to acknowledge it -- it's dumb. Please either put it back the way it was so it can be disabled or make it so there's none of this unnecessary unlocking of the phone to disable or enable it.
Wow, I could go on some more with issues, but I think for now that's verbose enough.
How do we get the OS developers to address these problems they created not fixed.