I found Android Wear to be superior to it. Some gripes I've had: read notifications aren't synced with the phone, it is impossible to mark an email as read without opening it, no third-party watch faces, the appointment shown on the watch face won't change to the next one until the current one is over (horrible with back to back appointments, Android shows the next one 10 minutes into the current one), the iMessage app often contains conversations I deleted weeks ago, apps are slow to launch and sometimes don't launch at all. Also no always on screen with slightly worse battery life (than Android).

The Apple Watch is a much better fitness tracker than my old Android Wear watch, which had a very inaccurate heart rate sensor.