I like mine
I've had my Samsung Gear 2 Neo for a couple of years now, and will be fairly unhappy if it ever craps out and I can't replace it. I'm not a big phone user, so my phone battery lasts about 4 days (its an old Galaxy S4 with a new battery). So does the watch battery - I charge them both every 4th morning.
What do I use the watch for? I use it to receive texts and phone calls mostly. Saves having to take my phone out of whatever pocket it is stuck in. In the winter, when the phone is in the inside pocket of a parka, I do *not* want to fight to get at the phone to answer it.
I also use the watch's step counter to see how far I go on my daily walks (4500 - 22,000). Every now and then I use it to take my pulse, but that's mostly a curiosity thing. I've heard that continuous pulse taking by fitness watches can bother some folks' skin - mine does it only when you ask it to, which is fine by me.
The Samsung watches *can* be voice controlled, for texting, calling, etc., but they use Samsung's voice recognition and it isn't as good as Google's for me.
The watch shows events from my phone too, and lets me acknowlege them directly. Again, handy when the phone is inconvenient (e.g. on a shelf at the other side of the room).
I have a couple of games on the watch, but rarely use them. Same for the phone.
Folks who say that a smartwatch is useless without having ever used one for a couple of months are doing others, who might get good use out of one, a disservice.
Note that mine does not have its own SIM - it is tied to the mothership by Bluetooth.