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Whether it's Half-Life's well-polished single-player experience, Left 4 Dead's intense multiplayer mayhem, or the amusing puzzle-like experience that was Portal, it's hard to argue with Valve pedigree, but you can certainly try if you'd like.
Well, you bring up some good points, but I'm sure they can work something out; the events of Portal and Portal 2 happen during the events of the Half Life series as well, so perhaps finally having those two overlap somehow could work to solve the problem. Honestly, I'd be fascinated if she had a role in Episode 3. It would be the perfect way to tie the two stories together.
"True knowledge is birth, and also death."
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