Did you actually use WebOS? I've had a great experience with the Palm Pre phones, way ahead of its time.
But you do have to admit that UI latency on it was quite high compared to iOS. I mean, so was Android back then, but they improved it significantly.
There’s good reason to blelieve that given enough time and even a fraction of resources that the Android team had WebOS would be able to significantly up their performance game (I say a fraction of resources because there is a lot of well funded open source development being done to improve web tech on mobile, through Chromium, WebKit and Firefox that would be leveraged).