I definintely agree about Episode 1 being too short. I spent the whole of the Citadel/ Underground section just looking forward to getting out, but by the time I'd got onto the streets of City 17, it was all but over.
Really loving the outdoorness of Episode 2 though. I hope it's a little bit longer and a little bit more combat. The first couple of parts of Ep. 1 really felt like they were on rails to me, and while there were one or two great (read: terrifying) sections, on the whole it wasn't what HL was all about to me.
Well looking forward to the additional multi in Ep. 2 as well, being an old TFC player although I am sceptical as to how long I'll be playing it for when all they really seem to have done is give it a lick of paint.