Don't force reactions out of yourself - the majority of the potential audience will perceive it as phony. Pace yourself with the quips so that the gameplay has a chance to actually have a presence within the video and your releases don't become vanity projects. And lastly, look into sound mixing and learn basic sound level balancing out - the contrasts in the db between the source ones and your added audio are Incredibly distracting. Hope my tips will help out and you create your online spot soon enough.