Facetime sucks. Considering that fewer and fewer people actually use their phones to call, you can go figure how many use them for video-calls. And if I have to, I use Skype as that's what's on everyone else's phone.
FaceTime is ZERO configuration so it is dead simple for anybody to use... and it has the highest video quality as well. Skype takes about 10 steps to install & configure, which can be extremely frustrating. Not to mention that its interface is overwhelming & confusing for newbies. FaceTime is absolutely simple as can be... no configuration, no setup, nothing. Just make a call.
And let's not forget that the iPhone was the very first phone to offer native videochats, so Apple gets the credit for kickstarting the whole mobile videochat revolution with FaceTime. I don't even know if any phones had a front facing camera before Apple invented FaceTime.
Apple innovation, like always.