Quite true. I bought it for the GPS, mapping, and battery life, but this was really a mistake.
I have 8.5 inch wrists, and even though that's relatively chunky, the Garmin looks absolutely ridiculous.
The thing about fitness and sleep tracking is it's only useful if you're wearing the device pretty much all the time, particularly for things like daily calorie burn.
Whereas I found that there are so many contexts where it either wasn't appropriate, or I didn't want to, wear a gigantic activity watch. I slugged it out for a few months, but in the end gave up on it because it wasn't really practical or stylish.
The maps are something of a wash as well, because the screen is so tiny.
My other arguments stand, to the point where I wouldn't even recommend buying one of the smaller ones unless you really need the water resistance. I imagine even the smaller models still have better battery life than the Apple Watch, so that's another consideration.