Gen 2 apple watch IS waterproof. I have what people call the G 0 (I know it is silly), because they re-released the initial apple watch with some tweaks, and the called the newest version G 2. G0/G1 are splash proof, and many wear them in the shower. I have never showered with my G0, but it does have an IPX7 rating. I do not believe any of the watches (or even the iPhone 7) are warrantied for water damage.
You can adjust your daily/weekly goals on the apple watch, if you have it set too low, set it higher. Most people do find it very accurate.
I like mine, and as ej0304 stated, the biggest sell for me is the vibration. I am in a quite office, and often have meetings, so I'm used to leaving my phone on vibrate. I also have a huge iPhone 7 in a holster. I mainly use the watch as a notification device, and a email/call screening tool.