It's a lot like the early web... There were the "official" web sites which looked good, loaded quickly, and worked. And then there were java applets, which were slow to load, buggy, and looked like high school projects.
It's pretty much the same. The features that come built-in are really good, voice recognition is fantastic, and it's overall a useful gadget to have to play music, set timers, reminders, check weather, and sports schedules.
Try to use any of the silly "skills" available, and you'll be very disappointed. The integration sucks ("tell to "), reliability sucks, and, therefore, usability sucks. Apart from having my kids ask for fart noises, there's not much out there yet.