Ok...first off, I highly recommend checking out the other gaming reviews on this forum. They'll do nothing but help you at least learn from the mistakes other people are making, as well as the things they're doing right. With that said, I feel like you suffer from letting the game make your videos instead of the other way around. I don't feel much of a personality coming from you...and maybe it's because you're playing splinter cell...it might not be a good game to start off with. Let's Plays are hard because for someone to want to watch an entire playthrough wit someone, they need to like that person enough to watch you play all the way through it, if that makes any sense.
For me, jumping right into it...I feel like you don't have much of a personality. I feel like you're just going through the motions, responding to what's happening on the screen, throwing a taunt here and there...but I don't really need to see that...I could go buy the game and do that myself. What more do you have to offer, that's what you should ask yourself...because as an audience...we've seen this song and dance before...and it's gotten boring. I personally like watching people play while they tell a story, or at least give advice on how to play better. But if all I'm gonna get is "Going in," "yea," "oh s**t!", and "I can do this all day..." what makes your channel so special out of the thousands of other channels doing the exact same thing?
But hey, that's just my two cents...take with it what you will.