I mentioned in another thread my opinion of Speed Dominions, but I'll say the same here.
I don't like Speed Dominions for one reason: they can turn into a competition. Are there some good ones out there? I have no doubt. What can happen, despite our best of intentions, is that someone will twist it into a competition. Everyone has a good amount of planets, so if one of the fractions lose a planet or two, more material for the story. We're here to create stories worthy of remembering, not bicker about who is winning or losing.
On that note, I prefer to have everyone involved in the thread equally, not exclude people because the thread is done within two to three hours. I have class and work between 8 am to 9 pm daily, except for weekends. Yeah, people had fun, but I would not be able to post reliably =( If they do a Dominion over, say, a week, then I'd be happy with that =) It gives everyone a chance to be apart of it, rather than give people only a few hours to do something. This is just my opinion though, based on my limited timeframe to be apart of things.
As for the "RP Ideal", I love detail =) Whatever I write, there will always be a lot of it. I tend to RP with people that can also give detail, though they obviously don't have to match me post for post. What threads I've been apart of, I have enjoyed myself =) From past years, I don't always get the same enjoyable experience when RPing with one-liners, but that's just my preference. It's always up to the person what they enjoy doing, and mine is giving detail. Nothing wrong with one-liners.
However, I do agree with for a Dominion, whether it's a Speed Dominion or not, should have more detail than a sentence or two per post, to give the Dominion more...credibility, since it is about trying to take a planet after all. I speak about generally, but I haven't read many Dominion threads yet, so my opinion is only based on my reasoning, not what I have seen and read.