I read that a few people complained about how the Yakuza was too much like Billy from the first one and that it was better not to see Billy fight the Predator. Me personally, I've always wanted to see how that Predator/Billy fight went down ever since I saw that movie as a Kid. In fact I still get disappointed when I'm watching Predator and it cuts from Billy to his scream. So this Yakuza fight kind of made up for that for me.
Yeah, that part made sense since you could see that the Russian was pretty much hitting everything, but the dog. The first time you see the dogs though, everyone pours their ammo into one dog and it takes forever for it to drop. That's what bugged me.
Also I saw it mentioned that Laurence Fishborne was a negative for this movie, I just wanted to say that I thought he was hilarious. His little side conversations had me rolling.