Kind of interesting in theory to get people's opinions out there, but there's a lot of noise on top of the signal.
I can't really think of any generalizations I can comfortably make about dating within the CMU social scene; I only have a few examples, and I don't feel very confident they're typical. If I could go back in time and change anything, it would be to improve communication in both directions during that awkward pre-relationship stage. This ties into people complaining about the general huggy-touchy-feely culture of the lounge somewhat, since the presence of that culture means that someone not used to it winds up getting terribly confused signals. You come into it and are surprised by the frequency of otherwise strongly positive signals, and pretty soon you're burnt out on them, and fail to believe that any of them --- or any other behavior --- really means that someone of the appropriate sex in that group is attracted to you. Again, with the signal theory metaphor: the noise is so high, that one gives up looking for signal.
At least if "one" is "me". But at least one might reasonably find it frustrating.
Anyhow, I haven't been actively involved in that group or its modern-day continuation for a while. I'm certainly happy still, however, to make an effort to know some of the kids in the "lounge in exile" and keep in touch with what the undergraduate population in general is up to --- by whatever trickery it does so, CMU seems to find all kinds of brilliant and excited and great students to fill its rolls, and the occasionally midnight-oil burning intensity of the undergrad experience here is something I still feel very nostalgic for.