Im personally loving the whole scale any building any wall aspect of it. I can already see an epidemic on youtube of parkour videos for this like we have montages for halo lol. But the battle system is looking quite amazing as well. I love how your whole combat is reliant on countering and how you have to adapt on taking on multiple enemies at once. Another thing im loving is how you can make alliances with groups of people.
Over all this CoD4, and Two Worlds are the games im looking forward to most.
Not so much halo 3 despite how much of a halo fan i am.