I sometimes miss WebOS but not my slow, underpowered Pixi. WebOS is kind of a nice complement to WP7. Hope I can get one of those $100 Touchpads if they ever materialize again.
In terms of OS WebOS is gorgious. If things were addressed as they should have (assuming HP didn't run it into the ground) I honestly thing WebOS would have dominated. But in all fairness the hardware was weak. In a world of 4"+ screens WebOS fell short. In a world of App centric operating systems, where user's factor in apps into their decision for a phone, again they WebOS fell short.
Basic functions in WebOS were non existant. For example I could not accept calendar invites from my phone. I would never even think a phone couldn't do that. Further more, copy/pasting was a pain. Only certain text could be copy and pasted. Even if it was an email. Also, speed was an issue. Homebrew aside, most people don't like watching a program load. So why would they design the OS to pull up a card, have it blink a few times, then expand THEN load. The google maps app was horrible. When people asked me for directions, I would whip out the phone and load the app. It took so long that people would say "you know what. I have to go. Thanks anyway."
Design wise WebOS was amazing. The execution and support from developers was jus tnot there.
And to set the record straight, I LOVE my WP7 phone and potentially converted 3 people in my job. One had an Evo and gave it up. The other has a Nexus and is looking at the Titan. The other is looking to get rid of his personal BB, considered an android device, saw my DVP and is now looking at the Titan as well. It's a compelling OS.