I will never touch Source again, with Unreal Editor 3, Torque Game Engine, and CryENGINE, I won't even look at it. HL2 lighting, game play, and physics are way too outdated and Unreal 3 Engine has just about the best damn graphics on the planet. That was the stuff they used to create games like Gears of War; incredible graphics and lighting.
http://www.unrealtechnology.com/html/technology/ue30.shtmlhttp://www.garagegames.com/products/torque/tgea/Not only that, but Source has way too many bugs and I just don't have enough freedom to make what I want in it. Constant leaks, AI scripting errors, slow loading times no matter how wisely you spend your budget; I just don't have enough patience or time to deal with it.