I wouldn't call it dead, but past its prime. Before GMod 13, you could find tons of different gamemodes all booming with players. Once they changed the legacy server browser to the current one that lists gamemodes by popularity, you basically just have a huge funnel of DarkRP servers, with most being cancerous with 100+ rules. Stronghold and Spacebuild were pretty cool, I'd love to see Stronghold make a comeback actually.