Well, I kinda suck at competitive RTS, so my primary contribution in The Frozen Throne was "how quickly can a noob lose to a hero rush?"

And the answer to that was "pretty fast."

Portal's set in the same universe as Half-Life, so they already have many ways to explain time travel and other weirdness. This does make me a lot more interested, if only to see Earth's future, post-Combine, post-whatever else.