I felt that webOS was immature. There was places that weren't smooth. Also, some of the web rendering was just messed up. I have seen characters broken in two.
Rendering glitch aside, it was the best designed OS for it's time. Interactive notifications, gestures, multitasking and app switching. all copied by ios and android after webos fell apart.
Well in the case of ICS, it's more accurate to say that Matias Duarte re-used his earlier ideas than "copied" from himself.