So I went ahead and downloaded the DLC. My Berserker was level 24 when I went into Zombie Island. I thought I would take a break from the main game and check it out. I ended up playing through the DLC in one go, and really enjoyed it. People that say Zombies are over saturated in games are just wrong. Zombies never get old. And the Zombies in this game are great fun to shoot. I ended up finishing up Zombie Island on level 30. So I am a bit overpowered on my main story quests at the moment. I also went into a friend’s game for a bit who is a level 50. He boosted me a few levels as well. Been playing a lot more today and I am now a level 35. I can’t stress how much I love this game. Apart from my brief extremely laggy co-op experience (thanks to a very intermittent Internet connection), I have been playing it on my own. I can see how awesome it would be with another person or 3 though.