If they do another 'Gun', which was a pretty good game, they need to make it a lot longer and make the world more open than it was. I felt like a lot of areas were really small and claustrophobic, and agree that it was a short game. I finished almost everything, including the side missions where you hunt down criminals for money, too quickly.I don't think anyone has mentioned it yet but I'd love to see Gun 2. I had a great time playing Gun, although it was a little short.
Portal 2 is one I'm looking forward to.