Beaten it.
Good:
- Graphics are very good, but the design is even better. The large views, the run-down laboratories, the changing backgrounds from hyper-modern testing areas to 1950 ones.
- The addition of the blue, orange and white gel makes for some nice puzzles. Having only puzzles with portals would bore me, I think.
- Sound is good, the voice actors of GLaDoS, Cage Johnson and Wheatey are all brilliant.
- The story, for those that pay attention, is good.
- Lots of attention to detail. Anyone saw the machine assembling the turret drones and packing it in? It's inbetween levels and it looks stunning. Loads of details everywhere. The animation is also top notch, the machines really, really come to life.
- The last 2 chapters are good, the puzzles pick up in difficulty and there is less walking.
Bad:
- Humour works, but gets stale half-way through. I wasn't laughing much after chapter 6.
- In fact, the game takes a nosedive in chapter 6. You're walking more and more, puzzling less and less. Way too many obstacles in this chapter can be solved by falling from a great height into a portal, catapulting you across the room. It sets the stage for the fall of Aperture, but boy is this part boring.
- While old laboratories make for an interesting back-story, the colours are all very drab and gray. Combine this with massive walking and few interesting puzzles, it's a boring 1 to 2 hours you'll be spending before getting to the end.
- Replayability is close to zero. Puzzles can only be solved one way, especially the latter ones. The addition of the gel doesn't improve this.
- It's not that long. It took me about 6 hours and apart from another run at Coop I don't think I'll be back.