Do what you feel. I personally like intros cause I like to know what I'm watching, and it associates you with the video. You get a little more known if people see that it's Jak6Jak's gaming video than just 'oh, it's some gaming vid'. I guess it depends. If you want it to be some kind of show or series, then intro, if it's just a random like 'me and my friends acted stupid over XBox Live one afternoon and decided to record it' then you don't need an intro.