Ok...well, this isn't your first rodeo, I see. I have a question: since this is your third channel...how's your conversion rate between your channels? Do you get the same amount of subscribers you've been getting on your other channels?
My advice to you would to be to just stick with one channel! Constant changing marks an uneasy feeling with subscribers, or at least to me as a potential subscriber. How do I know you won't just quit this one like you did the others, you know? But other than that...I don't have much advice to give on just one video...I always end up getting into arguments over people when I say that intros in gameplays aren't very necessary...so it's really a choice for you. I would suggest you check the other reviews for gaming channels so you can see what other people in your situation are doing well or mistakes you may want to avoid.
But that's just my two cents, take with it what you will.