I'm really surprised to hear that somebody can't make it through the day with the new Moto. I think the battery life is stellar, much better than other AW watches I've had, better than the Samsung Gear S2 and definitely better than my wifes Apple Watch. I have the 46mm version and I usually put it on about 7:30am, have ambient screen on, wrist gestures on, wifi on, and when I put it on the charger at about 11pm, I'll almost always have 40-50% left.
A short story when I was traveling: I went on a work trip last week, left for the airport at 4am with my watch on, and when I got to my hotel that night I realized I had forgotten to bring the watch charger or any other Qi charger with me! So I turned off ambient, wifi, turned the screen down and of course turned the watch off at night to see how long it would last. Thursday afternoon when I got home, I still had about 5% battery left! I successfully made it through 4 full days with one charge. Admittedly I was milking it a little, but still, that is pretty damn impressive.