Where RFoM was a unique, WW2 styled shooter featuring an alien invasion, R2 was more tooled to be just like Halo. Some people liked it, and the new guns were nice to be sure, but I felt it was a step in the wrong direction.
Mirror's Edge was a unique First Person Parkour adventure platformer, designed solely around going fast. Literally a game geared towards speedrunning. Visually still holds up well due to the smart art direction.
While not the blockbuster multiplayer hit that CoD4 was, I love WaW just the same for its incredibly paced campaign and the introduction of the Zombies survival mode. Many hours were lost to Zombies and its great DLC maps.
I'm more of a Killing Floor man myself, but the linear level design with objectives to achieve before you can escape is an experience that isn't provided by many other games.
Among the people who have actually played this, I think its actually a little overrated, but there's something charming about a FMV/live-action VN. Goofy characters and scenarios, I'd still recommend this if this sort of thing is up your alley.
It's a shame that there was so much controversy surrounding this game's E3 trailer that it became famous for it, because I genuinely thought it was fantastic. Cool action campaign and incredible multiplayer.
The game that got me into the Yakuza series, though ultimately it ended up being the weakest one. Still, I did enjoy the Okinawa segments and thought the orphanage stuff was nice.