The Moto Watch feels like a kid trying their hardest to stand out in a sport, only to walk away with a participation trophy. Having spent years reviewing pricey fitness trackers and smartwatches , I know how rare it is for a relatively affordable $150 device to arrive with real fitness credibility, so I was genuinely rooting for this one. When Motorola announced a partnership with Polar, along with dual-band GPS and week-long battery life at this price, it sounded like a breakthrough moment. I thought this could be Motorola's big return to relevance in wearables. Then I actually used it for a few weeks and reality set in. Motorola isn't a stranger to this space. The Moto 360 helped define early Android wearables back in 2014, and made a strong impression doing so. But the years since have been relatively slow on its wearables front.…