This index was in very sad shape. It was started a couple years ago, but quickly abandoned for whatever reason and never really got off the ground... The HCG index could and should be a very important part of the overall index mix, so I've taken some much needed time to expand it from a few dozen games to a few thousand. The index still has a long way to go before it's able to identify anything serious, but it should have _some_ utility now.
The games indexed are fairly random at this point, some big, some fairly obscure. The next update will probably focus on including the more popular ones.