Beat single player yesterday - unimpressed.
The gels were under utilized and the maps were completely linear - "oh look, there's three spots on the map where portals can go, hmmm..."
Where are all the timed switches, the air juggling, heck even the turrets.
The launch pads were a weak idea also, whats the point of a having large room/map if you're just going to get carried over - all of those should have been a situation where you'd actually use portals to build up momentum to get to the other side.
And then there are no advanced maps, wtf?!
*Son, I am dissapoint*