Don't get me wrong, I LOVE Half-Life 2 and Episode 2. They're some of the best games I've ever played. But Episode 1 just didn't feel right... not much happened plot-wise, there were a lot more puzzle areas that seemed forced. Also the escort part at the end. Not that it was particularly hard, it's just that escort missions always get on my nerves. The boss fight was kind of anticlimatic too.