I have a hypothesis, correct me if I am wrong.
I think the lack of anything HL2 (at least here at Snarkpit) is the lack of any maps with downloads available. Consider, the majority of anything we see is either images or 100% completed.
Once upon a time, everything we saw had our full attention because we all participated (or had the option to, we could be active or inactive by choice). Now all we get to do is look from the sidelines.
Personally, I am fully cognizant of the thinking that the bigger a website gets, the less personal it also gets but... I think that if we applied just a few of our old morals to the newer members we would generate more interest in HL2 mapping.
The problem is IMO, most of the newer member have not taken the time to read through our maps forums and seen all the high level critiques we have made in the past. Sad really, but I wish we had put more pressure on Lep to include quality feedback critiques in the site and made them "On Par" with "Reviews"
I bet if we polled the new members, they wouldn't have a clue as to what a critique is, and those that did know, wouldn't know what a quality one looked like. Tis why none of them request any.
HL2 won't ever be on par with HL1 until the community creates the conditions necessary to have it so. Ask yourself this.. When was the last time more than 10-15 members actively participated in a n00b map? I am not talking about idle comments, I mean in depth. We used to have that all the time.
/observational commentary.