About the gas giant to rocky planet ratio, I think it's around 1000 extra solar planets in total to 100 or so rocky planets, last time I checked. Which is probably a long time ago, so I don't remember where I read it, but I'm almost certain that at the very least we've found more gas giants than rocky planets, if not that there are more gaseous planets than rock-based ones.
But again, I think that's a big assumption to make due to the fact that we simply lack more sophisticated ways of detecting planets. Imagine if you were looking at our solar system from afar. What's the first thing you're going to see (besides the sun of course).
4 gas giants that's what.
The comparatively tiny Mercury, Venus, Earth, and Mars likely wouldn't even make it onto your radar.
Heck, we just discovered Pluto has a fifth moon. http://science.slashdot.org/story/12/07/11/1814253/hubble-discovers-5th-moon-of-pluto
If we're still discovering moons within our very own solar system. Then we've got a heck of a long way to go before we can say for certain whether other solar systems contain rocket planets or not.
And I mean consider this. If it IS true that there are more gas giants than rocket planets. Then that would make our solar system the exception. We have a 50% split.
Are we that unique? A habitable planet AND a solar system with an equal ratio of rocky to gas?
I have my doubts.