It's a shame really that only so few games used this engine over the last few years and when they did they were more underwhelming than the original product. I love my HL2 fix as much as the next guy but the Episodes are dragging for too long. Two short addons per year would be perfect, three short, pretty average and forgettable in terms of storyline episodes across 6 years, that's just stretching fanbase towards breaking point. I am one creak and snap away from loosing interest in anything Valve intends to milk next decade. Even amateur, free mods are coming out faster than Valve products.