Umm, what? Why? One is a Single Player story based game, the other is a Multi-Player DM mechanics based game.
I bet he means HLDM, which I also vastly preferred to the Quake DM games. Just much more fun, with the land mines, crossbow, crowbar, and those little critters you could drop on folks (forgot their names at the moment)!
Now these points of data make a beautiful line
And we’re out of beta, we’re releasing on time
So I’m GLaD I got burned, think of all the things we learned
For the people who are still alive
Have I lied to you? I mean, in this room? Trust me, leave that thing alone. - GLaDOS
Did IQs just drop sharply while I was away? - Ripley